0001213900-25-090697 | S-4/A | XBRL Viewer

Excludes up to 750,000 Class B ordinary shares subject to forfeiture if the over-allotment option is not exercised in full or in part by the underwriters (Note 6). On August 19, 2024, the Company consummated its IPO and sold 23,000,000 Units, including 3,000,000 Units sold pursuant to the full exercise of the underwriters’ option to purchase additional units to cover the over-allotment, hence the 750,000 shares of Class B ordinary shares were no longer subject to forfeiture.

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

+ References

+ Details

Commitments and Contingencies (Details) - USD ($)			6 Months Ended	9 Months Ended
Commitments and Contingencies (Details) - USD ($)	Mar. 26, 2025	Aug. 19, 2024	Jun. 30, 2025	Dec. 31, 2024
Commitments and Contingencies [Line Items]
Underwriters option period			45 days	45 days
Cash underwriting discount			$ 10,720,000	$ 10,720,000
Deferred underwriting fee payable			10,720,000	10,720,000
Redemption price	$ 925,000,000		925,000,000
Forward purchase liability			$ 1,057,124
Class A Ordinary Shares [Member]
Commitments and Contingencies [Line Items]
Ordinary share par value (in Dollars per share)			$ 0.0001
Convert shares (in Shares)			1
Par value per share (in Dollars per share)			$ 0.0001	$ 0.0001
Over-Allotment Option [Member]
Commitments and Contingencies [Line Items]
Purchase of additional shares (in Shares)		3,000,000	3,000,000
Percentage of gross proceeds units offered			6.40%	6.40%
Deferred underwriting discount			4.40%	4.40%
Deferred underwriting fee payable			$ 10,720,000	$ 10,720,000
Shares issued (in Shares)		3,000,000		3,000,000
Over-Allotment Option [Member] \| Class A Ordinary Shares [Member]
Commitments and Contingencies [Line Items]
Shares issued (in Shares)		3,000,000
IPO [Member]
Commitments and Contingencies [Line Items]
Share price (in Dollars per share)		$ 10
Cash underwriting discount			$ 4,000,000	$ 4,000,000
Percentage of gross proceeds units offered			2.00%	2.00%
Ordinary share par value (in Dollars per share)		$ 10
Shares issued (in Shares)		23,000,000
IPO [Member] \| Class A Ordinary Shares [Member]
Commitments and Contingencies [Line Items]
Share price (in Dollars per share)		$ 10
Ordinary share par value (in Dollars per share)		$ 10
Shares issued (in Shares)		23,000,000
Common Stock [Member]
Commitments and Contingencies [Line Items]
Convert shares (in Shares)			1
Par value per share (in Dollars per share)				$ 0.0001
Common Stock [Member] \| Private Investment in Public Equity [Member]
Commitments and Contingencies [Line Items]
Purchase of additional shares (in Shares)	5,000,000		5,000,000
Share price (in Dollars per share)	$ 10		$ 10

Significant Accounting Policies (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Significant Accounting Policies [Abstract]

Schedule of Basic and Diluted Net Income Per Ordinary Share

The following tables reflect the calculation of basic and diluted net income (loss) per ordinary share (in dollars, except per share amounts):

	For the Three Months Ended June 30, 2025				For the Six Months Ended June 30, 2025				For the Period from April 4, 2024 (Inception) Through June 30, 2024
	Class A		Class B		Class A		Class B		Class A		Class B
Basic and diluted net income (loss) per ordinary share
Numerator:
Allocation of net income (loss)	$	480,822	$	120,205	$	1,032,821	$	258,205	$	—	$	(52,663	)
Denominator:
Basic weighted average shares outstanding		23,000,000		5,750,000		23,000,000		5,750,000		—		5,000,000
Basic and diluted net income (loss) per ordinary share	$	0.02	$	0.02	$	0.04	$	0.04	$	—	$	(0.02	)

The following tables reflect the calculation of basic and diluted net income per ordinary share (in dollars, except per share amounts):

	For the Period from April 4, 2024 (Inception) Through December 31, 2024
	Class A		Class B
Basic and diluted net income per ordinary share
Numerator:
Allocation of net income	$	2,325,597	$	1,083,191
Denominator:
Basic weighted average shares outstanding		11,372,694		5,297,048
Basic net income per ordinary share	$	0.20	$	0.20

Schedule of Class A Ordinary Shares Subject to Redemption

As of June 30, 2025 and December 31, 2024, the Class A ordinary shares subject to redemption reflected in the condensed consolidated balance sheets are reconciled in the following table:

Gross proceeds	$	230,000,000
Less:
Proceeds allocated to Public Warrants		(529,000	)
Class A ordinary shares issuance costs		(15,341,097	)
Plus:
Accretion of carrying value to redemption value		21,063,682
Class A ordinary shares subject to possible redemption, December 31, 2024		235,193,585
Plus:
Accretion of carrying value to redemption value		2,462,864
Class A ordinary shares subject to possible redemption, March 31, 2025		237,656,449
Plus:
Accretion of carrying value to redemption value		2,477,726
Class A ordinary shares subject to possible redemption, June 30, 2025	$	240,134,175

As of December 31, 2024, the Class A ordinary shares subject to redemption reflected in the balance sheet are reconciled in the following table:

Gross proceeds	$	230,000,000
Less:
Proceeds allocated to Public Warrants		(529,000	)
Class A ordinary shares issuance costs		(15,341,097	)
Plus:
Accretion of carrying value to redemption value		21,063,682
Class A ordinary shares subject to possible redemption, December 31, 2024	$	235,193,585

- Definition

Tabular disclosure of temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References + Details

Fair Value Measurements (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Fair Value Measurements [Abstract]

Schedule of Company’s Assets that are Measured at Fair Value

The following tables present information about the Company’s assets that are measured at fair value on June 30, 2025 and December 31, 2024, and indicate the fair value hierarchy of the valuation inputs the Company utilized to determine such fair value:

	Fair Value Measured as of June 30, 2025
	Level 1		Level 2		Level 3		Total
Assets
Money market mutual fund held in Trust Account	$	240,134,175	$	—	$	—	$	240,134,175
Liabilities:
Forward purchase agreement liability	$	—	$	—	$	1,057,124	$	1,057,124
Total forward purchase agreement liability	$	—	$	—	$	1,057,124	$	1,057,124

	Fair Value Measured as of December 31, 2024
	Level 1		Level 2		Level 3		Total
Assets
Money market mutual fund held in Trust Account	$	235,193,585	$	—	$	—	$	235,193,585

The following table presents information about the Company’s assets that are measured at fair value on December 31, 2024, and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine such fair value:

	Level	December 31, 2024
Assets:
Money market mutual fund held in Trust Account	1	$	235,193,585

The following table presents information about the Company’s assets that are measured at fair value on August 19, 2024, and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine such fair value:

	Level	August 19, 2024
Equity:
Fair value of Public Warrants for Class A ordinary shares subject to redemption allocation	3	$	529,000

Schedule of Fair Value of the Forward Purchase Agreement Derivative Liability

In order to calculate the fair value of the forward purchase agreement derivative liability, the Company utilized the following inputs:

	March 26, 2025 (Initial measurement)			June 30, 2025
Probability of business combination		90	%		90	%
Underlying ordinary share price	$	10.80		$	11.10
Term (years)		0.42			0.25
Risk-free rate		4.28	%		4.41	%
Volatility		10.73	%		28.82	%

The fair value of Public Warrants was determined using Monte Carlo Simulation Model. The Public Warrants have been classified within shareholders’ deficit and will not require remeasurement after issuance. The following table presents the quantitative information regarding market assumptions used in the valuation of the Public Warrants:

	August 19, 2024
Underlying share price	$	9.98
Exercise price	$	11.50
Term (years)		7.0
Risk-free rate		3.78	%
Volatility		9.0	%

Schedule of Changes in the Fair Value

The following table presents the changes in the fair value of the forward purchase agreement (“FPA”) derivative liability:

	FPA
Fair value as of March 26, 2025 (initial measurement)	$	893,425
Change in fair value		(223,693	)
Fair value as of March 31, 2025	$	669,732
Change in fair value		387,392
Fair value as of June 30, 2025	$	1,057,124

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References + Details

Private Placement (Details) - USD ($)	6 Months Ended	9 Months Ended
Private Placement (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Private Placement [Line Items]
Exercise of warrants (in Dollars per share)	$ 11.5	$ 11.5
Gross proceeds of private placement (in Dollars)		$ 6,850,000
Optional redemption of public shares percentage accordance with completion of business combination	100.00%	100.00%
Warrant [Member]
Private Placement [Line Items]
Purchase of warrants	6,850,000	6,850,000
Exercise of warrants (in Dollars per share)	$ 1	$ 1
Private Placement Warrants [Member]
Private Placement [Line Items]
Purchase of warrants	6,850,000	6,850,000
Gross proceeds of private placement (in Dollars)	$ 6,850,000	$ 6,850,000
Business Combination [Member]
Private Placement [Line Items]
Warrant term	5 years	5 years
Business Combination [Member] \| Warrant [Member]
Private Placement [Line Items]
After completion initial business combination	30 days	30 days
Sponsor [Member] \| Private Placement Warrants [Member]
Private Placement [Line Items]
Purchase of warrants	4,275,000	4,275,000
Cantor Fitzgerald & Co.[Member] \| Private Placement Warrants [Member]
Private Placement [Line Items]
Purchase of warrants	2,575,000	2,575,000
Class A Ordinary Shares [Member]
Private Placement [Line Items]
After completion initial business combination	1 year
Class A Ordinary Shares [Member] \| Warrant [Member]
Private Placement [Line Items]
Purchase warrants	1	1
Exercise of warrants (in Dollars per share)	$ 11.5	$ 11.5
Class A Ordinary Shares [Member] \| Business Combination [Member]
Private Placement [Line Items]
After completion initial business combination		1 year
Private Placement [Member] \| Warrant [Member]
Private Placement [Line Items]
Warrant term	5 years	5 years
Private Placement [Member] \| Business Combination [Member]
Private Placement [Line Items]
After completion initial business combination	30 days	30 days

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended	6 Months Ended	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2025	Dec. 31, 2024
Cash Flows from Operating Activities:
Net income (loss)	$ (52,663)	$ 1,291,026	$ 3,408,788
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Formation costs paid by Sponsor in exchange for issuance of Class B ordinary shares	12,463		12,463
Payment of operation costs through promissory note			45,200
Formation and operational costs paid through promissory note – related party	40,200
Interest earned on marketable securities held in Trust Account		(4,940,590)	(4,043,585)
Initial loss on forward purchase agreement liability		893,425
Change in fair value of forward purchase agreement liability		163,699
Other receivable		41,250	(41,250)
Prepaid expenses		(54,870)	(16,112)
Due from Sponsor			(4,466)
Short term prepaid insurance			(90,250)
Long-term prepaid insurance		45,125	(52,646)
Accrued expenses		2,016,929	458,624
Net cash used in operating activities		(544,006)	(323,234)
Cash Flows from Investing Activities:
Investment of cash into Trust Account			(231,150,000)
Net cash used in investing activities			(231,150,000)
Cash Flows from Financing Activities:
Proceeds from sale of Units, net of underwriting discounts paid			226,000,000
Proceeds from sale of Private Placements Warrants			6,850,000
Repayment of promissory note – related party			(233,127)
Payment of offering costs			(475,550)
Net cash provided by financing activities			232,141,323
Net Change in Cash		(544,006)	668,089
Cash – Beginning of period		668,089
Cash – End of period		124,083	668,089
Non-Cash investing and financing activities:
Deferred offering costs included in accrued offering costs	251,891
Deferred offering costs paid through promissory note – related party	107,927		187,927
Deferred underwriting fee payable			10,720,000
Accretion of Class A ordinary shares to redemption value			21,063,682
Deferred offering costs paid by Sponsor in exchange for issuance of Class B ordinary shares	12,537		$ 12,537
Prepaid services contributed by Sponsor through promissory note – related party	$ 5,000

Subsequent Events

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

NOTE 10. SUBSEQUENT EVENTS

The Company evaluated subsequent events and transactions that occurred after the condensed consolidated balance sheet date up to the date that the unaudited condensed consolidated financial statements were issued. Based upon this review, the Company did not identify any subsequent events that would have required adjustment or disclosure in the unaudited condensed consolidated financial statements.

NOTE 11. SUBSEQUENT EVENTS

The Company evaluated subsequent events and transactions that occurred after the balance sheet date up to the date that the financial statements were issued. Based upon this review, other than as described below, the Company did not identify any subsequent events that would have required adjustment or disclosure in the accompanying financial statements.

On March 26, 2025, the Company entered into a Business Combination Agreement (as it may be amended, supplemented or otherwise modified from time to time in accordance with its terms, the “Business Combination Agreement”) by and among the Company, Terrestrial Energy Inc., a Delaware corporation (“Terrestrial Energy”), and HCM II Merger Sub Inc., a Delaware corporation and a direct wholly owned subsidiary of Company (“Merger Sub”), pursuant to which, among other things and subject to the terms and conditions contained therein, Merger Sub will merge with and into Terrestrial Energy (the “Merger”), with Terrestrial Energy continuing as the surviving entity (the “Surviving Company”). The transactions contemplated by the Business Combination Agreement are referred to herein as the “Business Combination.” The combined company’s business will continue to operate through Terrestrial Energy and its subsidiaries.

The Business Combination Agreement and the Business Combination were unanimously approved by the board of directors of the Company and the board of directors of Terrestrial Energy.

The Business Combination is expected to close in the fourth quarter of 2025, subject to the receipt of the required approvals by Company’s shareholders and the fulfilment of other customary closing conditions.

In addition to the Merger, the Company will, subject to obtaining the required shareholder approvals and at least one (1) day prior to the date of the Closing, change its jurisdiction of incorporation by deregistering as a Cayman Islands exempted company and continuing and domesticating as a corporation incorporated under the laws of the State of Delaware. The Company will provide its public shareholders the opportunity to elect, at least two (2) Business Days prior to the Company shareholder’s meeting, to redeem their shares on the terms and conditions set forth in the Business Combination Agreement and the Company’s governing documents (the “Redemption”). Subject to the receipt of approval from shareholders of the Company, and at least one (1) day prior to the Domestication, the Company will carry out the Redemption.

By virtue of the Domestication and subject to the satisfaction or waiver of the conditions of the Business Combination Agreement, including approval of the Company’s shareholders: (i) immediately prior to the Domestication, each of the then issued and outstanding Class B Ordinary Shares of the Company will convert automatically, on a one-for-one basis, into one (1) Class A Ordinary Share, par value of $0.0001 per share, of the Company; and (ii) immediately following the Sponsor Share Conversion, in connection with the Domestication, (x) each then issued and outstanding Class A Ordinary Share (other than any Class A Ordinary Share included in the Cayman Purchaser Units (as defined in the Business Combination Agreement)) will convert automatically, on a one-for-one basis, into one (1) share of common stock, par value $0.0001 per share, of the Company (after the Domestication) (the “New Terrestrial Common Share”); (y) each of the then issued and outstanding warrants (other than any Cayman Purchaser Public Warrants (as defined in the Business Combination Agreement) included in the Cayman Purchaser Units) representing the right to purchase one (1) Class A Ordinary Share will convert automatically into a warrant to acquire one (1) share of New Terrestrial

Common Share (each a “New Terrestrial Warrant”); and (z) each of the then issued and outstanding Cayman Purchaser Units will be cancelled and each holder thereof will be entitled to one share of New Terrestrial Common Share and one-half (1/2) of one (1) New Terrestrial Warrant.

The Company has also entered into the PIPE Subscription Agreements, each dated as of March 26, 2025, with the PIPE Investors, pursuant to which, among other things, the Company has agreed to issue and sell, in private placements to close immediately prior to or substantially concurrently with the Closing, the PIPE Financing. The PIPE Investors are permitted, under the PIPE Subscription Agreements, to satisfy their commitments thereunder if they hold shares of New Terrestrial Common Share that qualify as Non-Redeemed Shares (as defined herein), subject to certain conditions and restrictions set forth in the PIPE Subscription Agreements.

Commitments and Contingencies

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Commitments and Contingencies [Abstract]

COMMITMENTS AND CONTINGENCIES

NOTE 6. COMMITMENTS AND CONTINGENCIES

Risks and Uncertainties

The United States and global markets are experiencing volatility and disruption following the geopolitical instability resulting from the ongoing Russia-Ukraine conflict and the recent escalation of the Israel-Hamas conflict. In response to the ongoing Russia-Ukraine conflict, the North Atlantic Treaty Organization (“NATO”) deployed additional military forces to Eastern Europe, and the United States, the United Kingdom, the European Union and other countries have announced various sanctions and restrictive actions against Russia, Belarus and related individuals and entities, including the removal of certain financial institutions from the Society for Worldwide Interbank Financial Telecommunication (SWIFT) payment system. Certain countries, including the United States, have also provided and may continue to provide military aid or other assistance to Ukraine and to Israel, increasing geopolitical tensions among a number of nations. The invasion of Ukraine by Russia and the escalation of the Israel-Hamas conflict and the resulting measures that have been taken, and could be taken in the future, by NATO, the United States, the United Kingdom, the European Union, Israel and its neighboring states and other countries have created global security concerns that could have a lasting impact on regional and global economies. Although the length and impact of the ongoing conflicts are highly unpredictable, they could lead to market disruptions, including significant volatility in commodity prices, credit and capital markets, as well as supply chain interruptions and increased cyberattacks against U.S. companies. Additionally, any resulting sanctions could adversely affect the global economy and financial markets and lead to instability and lack of liquidity in capital markets.

Any of the above-mentioned factors, or any other negative impact on the global economy, capital markets or other geopolitical conditions resulting from the Russian invasion of Ukraine, the escalation of the Israel-Hamas conflict and subsequent sanctions or related actions, could adversely affect the Company’s search for an initial Business Combination and any target business with which the Company may ultimately consummate an initial Business Combination.

Registration Rights

The holders of the founder shares, Private Placement Warrants and the Class A ordinary shares underlying such Private Placement Warrants and Private Placement Warrants and warrants that may be issued upon conversion of the Working Capital Loans will have registration rights to require the Company to register a sale of any of the Company’s securities held by them and any other securities of the Company acquired by them prior to the consummation of the initial Business Combination pursuant to a registration rights agreement to be signed prior to or on the effective date of the Initial Public Offering. The holders of these securities are entitled to make up to three demands, excluding short form demands, that the Company registers such securities. In addition, the holders have certain piggyback registration rights with respect to registration statements filed subsequent to the completion of the initial Business Combination. The Company will bear the expenses incurred in connection with the filing of any such registration statements.

Underwriter’s Agreement

The underwriter has a 45-day option from the date of the Initial Public Offering to purchase up to an additional 3,000,000 units to cover over-allotments, if any. On August 19, 2024, simultaneously with the closing of the Initial Public Offering, the underwriter elected to fully exercise the over-allotment option to purchase the additional 3,000,000 Units at a price of $10.00 per Unit.

The underwriter was entitled to a cash underwriting discount of $4,000,000 (2.0% of the gross proceeds of the units offered in the Initial Public Offering, excluding any proceeds from units sold pursuant to the underwriter’s over-allotment option). Additionally, the underwriter is entitled to a deferred underwriting discount of 4.40% of the gross proceeds of the Initial Public Offering held in the Trust Account other than those sold pursuant to the underwriter’s over-allotment option and 6.40% of the gross proceeds sold pursuant to the underwriter’s over-allotment option, $10,720,000 in the aggregate, payable upon the completion of the Company’s initial Business Combination subject to the terms of the underwriting agreement. At June 30, 2025 and December 31, 2024, the balance of the deferred underwriting fee payable was $10,720,000.

Business Combination Agreement

Pursuant to the Business Combination Agreement, the aggregate consideration to be paid in the Merger in respect of each Terrestrial Energy Common Share and each Terrestrial Energy Series A Preferred Share that is issued and outstanding immediately prior to the Effective Time (as defined in the Business Combination Agreement), will be a number of shares of Domesticated Common Stock equal to the Exchange Ratio (the “Per Share Base Consideration”). The “Exchange Ratio” is equal to the number of shares of Domesticated Common Stock equal to the quotient of (i)(a) $925,000,000, divided by (b) the Redemption Price divided by (ii) the Terrestrial Energy Fully Diluted Capital (as defined in the Business Combination Agreement).

The Business Combination Agreement and the Business Combination were unanimously approved by the board of directors of the Company and the board of directors of Terrestrial Energy.

In addition to the Merger, the Company will, subject to obtaining the required shareholder approvals and at least one (1) day prior to the date of the closing of the Business Combination (the “Closing”), change its jurisdiction of incorporation by deregistering as a Cayman Islands exempted company and continuing and domesticating as a corporation incorporated under the laws of the State of Delaware (the “Domestication”). The Company will provide its public shareholders the opportunity to elect, at least two (2) business days prior to the Company shareholder’s meeting, to redeem their shares on the terms and conditions set forth in the Business Combination Agreement and the Company’s governing documents (the “Redemption”). Subject to the receipt of approval from shareholders of the Company, and at least one (1) day prior to the Domestication, the Company will carry out the Redemption.

Conversion”); and (ii) immediately following the Sponsor Share Conversion, in connection with the Domestication, (x) each then issued and outstanding Class A Ordinary Share (other than any Class A Ordinary Share included in the Cayman Purchaser Units (as defined in the Business Combination Agreement)) will convert automatically, on a one-for-one basis, into one (1) share of common stock, par value $0.0001 per share, of the Company (after the Domestication) (the “Domesticated Common Stock”); (y) each of the then issued and outstanding warrants (other than any Cayman Purchaser Public Warrants (as defined in the Business Combination Agreement) included in the Cayman Purchaser Units) representing the right to purchase one (1) Class A Ordinary Share will convert automatically into a warrant to acquire one (1) share of Domesticated Common Stock (each a “Domesticated Warrant”); and (z) each of the then issued and outstanding Cayman Purchaser Units will be cancelled and each holder thereof will be entitled to one (1) share of Domesticated Common Stock and one-half (1/2) of one (1) Domesticated Warrant.

The Company has also entered into PIPE Subscription Agreements, each dated March 26, 2025, with the PIPE Investors, pursuant to which, among other things, the Company has agreed to issue and sell, in private placements to close immediately prior to or substantially concurrently with the Closing, an aggregate of 5,000,000 shares of Domesticated Common Stock for a purchase price of $10.00 per share. The PIPE Investors are permitted, under the PIPE Subscription Agreements, to satisfy their commitments thereunder if they hold shares of Domesticated Common Stock that qualify as Non-Redeemed Shares (as defined in the PIPE Subscription Agreements), subject to certain conditions and restrictions set forth in the PIPE Subscription Agreements.

The Company accounts for the Forward Purchase Agreement as a derivative instrument in accordance with the guidance in ASC 815-40. The instrument is subject to re-measurement at each balance sheet date, with changes in fair value recognized in the condensed consolidated statement of operations. The ability of the Company to receive any of the proceeds of the Forward Purchase Agreement is dependent upon the financial metrics of the business combination target, among other factors, rendering the receipt of such proceeds outside the control of the Company. As of June 30, 2025, the fair value of the forward purchase liability was $1,057,124.

NOTE 7. COMMITMENTS AND CONTINGENCIES

Risks and Uncertainties

Registration Rights

Underwriter’s Agreement

The underwriters have a 45-day option from the date of the Initial Public Offering to purchase up to an additional 3,000,000 units to cover over-allotments, if any. On August 19, 2024, simultaneously with the closing of the Initial Public Offering, the underwriters elected to fully exercise the over-allotment option to purchase the additional 3,000,000 Units at a price of $10.00 per Unit.

The underwriters were entitled to a cash underwriting discount of $4,000,000 (2.0% of the gross proceeds of the units offered in the Initial Public Offering, excluding any proceeds from units sold pursuant to the underwriters’ over-allotment option). Additionally, the underwriters are entitled to a deferred underwriting discount of 4.40% of the gross proceeds of the Initial Public Offering held in the Trust Account other than those sold pursuant to the underwriters over-allotment option and 6.40% of the gross proceeds sold pursuant to the underwriter’s over-allotment option, $10,720,000 in the aggregate, payable upon the completion of the Company’s initial Business Combination subject to the terms of the underwriting agreement. At December 31, 2024, the balance of the deferred underwriting fee payable was $10,720,000.

Fair Value Measurements

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Fair Value Measurements [Abstract]

FAIR VALUE MEASUREMENTS

NOTE 8. FAIR VALUE MEASUREMENTS

The fair value of the Company’s financial assets and liabilities reflects management’s estimate of amounts that the Company would have received in connection with the sale of the assets or paid in connection with the transfer of the liabilities in an orderly transaction between market participants at the measurement date. In connection with measuring the fair value of its assets and liabilities, the Company seeks to maximize the use of observable inputs (market data obtained from independent sources) and to minimize the use of unobservable inputs (internal assumptions about how market participants would price assets and liabilities). The following fair value hierarchy is used to classify assets and liabilities based on the observable inputs and unobservable inputs used in order to value the assets and liabilities:

		Level 1:		Quoted prices in active markets for identical assets or liabilities. An active market for an asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.
		Level 2:		Observable inputs other than Level 1 inputs. Examples of Level 2 inputs include quoted prices in active markets for similar assets or liabilities and quoted prices for identical assets or liabilities in markets that are not active.
		Level 3:		Unobservable inputs based on assessment of the assumptions that market participants would use in pricing the asset or liability.

	Fair Value Measured as of June 30, 2025
	Level 1		Level 2		Level 3		Total
Assets
Money market mutual fund held in Trust Account	$	240,134,175	$	—	$	—	$	240,134,175
Liabilities:
Forward purchase agreement liability	$	—	$	—	$	1,057,124	$	1,057,124
Total forward purchase agreement liability	$	—	$	—	$	1,057,124	$	1,057,124

	Fair Value Measured as of December 31, 2024
	Level 1		Level 2		Level 3		Total
Assets
Money market mutual fund held in Trust Account	$	235,193,585	$	—	$	—	$	235,193,585

Forward Purchase Agreement Liability

In order to calculate the fair value of the forward purchase agreement derivative liability, the Company utilized the following inputs:

	March 26, 2025 (Initial measurement)			June 30, 2025
Probability of business combination		90	%		90	%
Underlying ordinary share price	$	10.80		$	11.10
Term (years)		0.42			0.25
Risk-free rate		4.28	%		4.41	%
Volatility		10.73	%		28.82	%

The following table presents the changes in the fair value of the forward purchase agreement (“FPA”) derivative liability:

	FPA
Fair value as of March 26, 2025 (initial measurement)	$	893,425
Change in fair value		(223,693	)
Fair value as of March 31, 2025	$	669,732
Change in fair value		387,392
Fair value as of June 30, 2025	$	1,057,124

The change in the fair value of the forward purchase agreement liability for the six months ended June 30, 2025 is $163,699. There was no forward purchase agreement liability for the six months ended June 30, 2024.

There were no transfers between fair value levels during the period ended June 30, 2025 and for the year ended December 31, 2024.

NOTE 9. FAIR VALUE MEASUREMENTS

		Level 1:		Quoted prices in active markets for identical assets or liabilities. An active market for an asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.
		Level 2:		Observable inputs other than Level 1 inputs. Examples of Level 2 inputs include quoted prices in active markets for similar assets or liabilities and quoted prices for identical assets or liabilities in markets that are not active.
		Level 3:		Unobservable inputs based on assessment of the assumptions that market participants would use in pricing the asset or liability.

	Level	December 31, 2024
Assets:
Money market mutual fund held in Trust Account	1	$	235,193,585

	Level	August 19, 2024
Equity:
Fair value of Public Warrants for Class A ordinary shares subject to redemption allocation	3	$	529,000

	August 19, 2024
Underlying share price	$	9.98
Exercise price	$	11.50
Term (years)		7.0
Risk-free rate		3.78	%
Volatility		9.0	%

The Company accounted for warrants issued at the IPO under equity treatment, as such, no subsequent re-measurement is required.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

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+ Details

Significant Accounting Policies (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Significant Accounting Policies [Line Items]
Cash	$ 124,083	$ 668,089
Marketable Securities held in trust account	240,134,175	235,193,585
Federal deposit insurance corporation	250,000	250,000
Forward purchase derivative liability	$ 1,057,124
Public Placement Warrants [Member]
Significant Accounting Policies [Line Items]
Warrants issued (in Shares)	11,500,000	11,500,000
Private Placement Warrants [Member]
Significant Accounting Policies [Line Items]
Warrants issued (in Shares)	6,850,000	6,850,000

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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+ Details

Significant Accounting Policies - Schedule of Class A Ordinary Shares Subject to Redemption (Details) - Class A Ordinary Shares Subject to Redemption [Member] - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2024
Schedule of Class A Ordinary Shares Subject to Redemption [Line Items]
Gross proceeds			$ 230,000,000	$ 230,000,000
Proceeds allocated to Public Warrants			(529,000)	(529,000)
Class A ordinary shares issuance costs			(15,341,097)	(15,341,097)
Accretion of carrying value to redemption value	$ 2,477,726	$ 2,462,864	21,063,682	21,063,682
Class A ordinary shares subject to possible redemption	$ 240,134,175	$ 237,656,449	$ 235,193,585	$ 235,193,585

- Definition

Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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+ Details

Condensed Consolidated Statements of Changes in Shareholders’ Deficit (Unaudited) - USD ($)

Ordinary Shares

Class A

Ordinary Shares

Class B

Additional Paid-in Capital

Accumulated Deficit

Total

Balance at Apr. 03, 2024

Balance (in Shares) at Apr. 03, 2024

Issuance of Class B ordinary shares to Sponsor

^[1]

$ 575

24,425

25,000

Issuance of Class B ordinary shares to Sponsor (in Shares)

^[1]

5,750,000

Net income (loss)

(52,663)

Balance at Jun. 30, 2024

$ 575

24,425

(52,663)

(27,663)

Balance (in Shares) at Jun. 30, 2024

5,750,000

Balance at Apr. 03, 2024

Balance (in Shares) at Apr. 03, 2024

Accretion for Class A ordinary shares to redemption amount

(7,348,508)

(13,715,174)

(21,063,682)

Sale of 6,850,000 Private Placement Warrants

6,850,000

Fair value of Public Warrants at issuance

529,000

Allocated value of transaction costs

(54,917)

Issuance of Class B ordinary shares to Sponsor

^[2]

$ 575

24,425

25,000

Issuance of Class B ordinary shares to Sponsor (in Shares)

^[2]

5,750,000

Net income (loss)

3,408,788

Balance at Dec. 31, 2024

$ 575

(10,306,386)

(10,305,811)

Balance (in Shares) at Dec. 31, 2024

5,750,000

Accretion for Class A ordinary shares to redemption amount

(2,462,864)

Net income (loss)

689,999

Balance at Mar. 31, 2025

$ 575

(12,079,251)

(12,078,676)

Balance (in Shares) at Mar. 31, 2025

5,750,000

Balance at Dec. 31, 2024

$ 575

(10,306,386)

(10,305,811)

Balance (in Shares) at Dec. 31, 2024

5,750,000

Net income (loss)

1,291,026

Balance at Jun. 30, 2025

$ 575

(13,955,950)

(13,955,375)

Balance (in Shares) at Jun. 30, 2025

5,750,000

Balance at Mar. 31, 2025

$ 575

(12,079,251)

(12,078,676)

Balance (in Shares) at Mar. 31, 2025

5,750,000

Accretion for Class A ordinary shares to redemption amount

(2,477,726)

Net income (loss)

601,027

Balance at Jun. 30, 2025

$ 575

$ (13,955,950)

$ (13,955,375)

Balance (in Shares) at Jun. 30, 2025

5,750,000

[1]

Includes up to 750,000 Class B ordinary shares subject to forfeiture if the over-allotment option is not exercised in full or in part by the underwriters (Note 6). On August 19, 2024, the Company consummated its IPO and sold 23,000,000 Units, including 3,000,000 Units sold pursuant to the full exercise of the underwriters’ option to purchase additional units to cover the over-allotment, hence the 750,000 shares of Class B ordinary shares were no longer subject to forfeiture.

[2]

Included up to 750,000 Class B ordinary shares subject to forfeiture if the over-allotment option is not exercised in full or in part by the underwriters (Note 8). On August 19, 2024, the Company consummated its IPO and sold 23,000,000 Units, including 3,000,000 Units sold pursuant to the full exercise of the underwriters’ option to purchase additional units to cover the over-allotment, hence the 750,000 shares of Class B ordinary shares were no longer subject to forfeiture.

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

- Definition

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

+ References + Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

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+ Details

Segment Information - Schedule of Net Income and Total Assets (Details) - USD ($)	3 Months Ended				6 Months Ended	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Jun. 30, 2025	Dec. 31, 2024
Schedule of Net Income and Total Assets [Abstract]
Trust Account	$ 240,134,175	$ 240,134,175			$ 240,134,175	$ 235,193,585
Cash	124,083	124,083			124,083	668,089
Net income	601,027	(52,663)	$ 689,999	$ (52,663)	1,291,026	3,408,788
General and administrative expenses	$ 1,489,307	$ 52,663		52,663	2,592,440	634,797
Interest earned on marketable securities held in Trust Account					$ 4,940,590	$ 4,043,585

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Shareholders’ Deficit

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Shareholders’ Deficit [Abstract]

SHAREHOLDERS’ DEFICIT

NOTE 7. SHAREHOLDERS’ DEFICIT

Preference Shares — The Company is authorized to issue a total of 1,000,000 preference shares at par value of $0.0001 each. As of June 30, 2025 and December 31, 2024, there were no preference shares issued or outstanding.

Class A Ordinary Shares — The Company is authorized to issue a total of 200,000,000 Class A ordinary shares at par value of $0.0001 each. As of June 30, 2025 and December 31, 2024, there were no shares of Class A ordinary shares issued or outstanding, excluding 23,000,000 Class A ordinary shares subject to possible redemption.

Class B Ordinary Shares — The Company is authorized to issue a total of 20,000,000 Class B ordinary shares at par value of $0.0001 each. On April 8, 2024, the Company issued 5,750,000 Class B ordinary shares to the Sponsor for $25,000, or approximately $0.004 per share. As of June 30, 2025 and December 31, 2024, there were 5,750,000 Class B ordinary shares issued and outstanding.

shares underlying the private placement warrants issued to the Sponsor), plus (ii) all Class A ordinary shares and equity-linked securities issued or deemed issued, in connection with the closing of the initial Business Combination (excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial Business Combination and any private placement-equivalent warrants issued to the Sponsor or any of its affiliates or to the Company’s officers or directors upon conversion of working capital loans) minus (iii) any redemptions of Class A ordinary shares by public shareholders in connection with an initial Business Combination; provided that such conversion of founder shares will never occur on a less than one-for-one basis.

Holders of record of the Company’s Class A ordinary shares and Class B ordinary shares are entitled to one vote for each share held on all matters to be voted on by shareholders. Unless specified in the amended and restated memorandum and articles of association or as required by the Companies Act or stock exchange rules, an ordinary resolution under Cayman Islands law and the amended and restated memorandum and articles of association, which requires the affirmative vote of at least a majority of the votes cast by such shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the applicable general meeting of the Company is generally required to approve any matter voted on by shareholders. Approval of certain actions requires a special resolution under Cayman Islands law, which (except as specified below) requires the affirmative vote of at least two-thirds of the votes cast by such shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the applicable general meeting, and pursuant to the amended and restated memorandum and articles of association, such actions include amending the amended and restated memorandum and articles of association and approving a statutory merger or consolidation with another the company. There is no cumulative voting with respect to the appointment of directors, meaning, following the initial Business Combination, the holders of more than 50% of the ordinary shares voted for the appointment of directors can elect all of the directors. Prior to the consummation of the initial Business Combination, only holders of the Class B ordinary shares will (i) have the right to vote on the appointment and removal of directors and (ii) be entitled to vote on continuing the Company in a jurisdiction outside the Cayman Islands (including any special resolution required to amend the constitutional documents or to adopt new constitutional documents, in each case, as a result of the approving a transfer by way of continuation in a jurisdiction outside the Cayman Islands). Holders of the Class A ordinary shares will not be entitled to vote on these matters during such time. These provisions of the amended and restated memorandum and articles of association may only be amended if approved by a special resolution passed by the affirmative vote of at least 90% (or, where such amendment is proposed in respect of the consummation of the initial Business Combination, two-thirds) of the votes cast by such shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the applicable general meeting of the Company.

NOTE 8. SHAREHOLDER’S DEFICIT

Preference Shares — The Company is authorized to issue a total of 1,000,000 preference shares at par value of $0.0001 each. As of December 31, 2024, there were no shares of preference shares issued or outstanding.

Class A Ordinary Shares — The Company is authorized to issue a total of 200,000,000 Class A ordinary shares at par value of $0.0001 each. As of December 31, 2024, there were no shares of Class A ordinary shares issued or outstanding, excluding 23,000,000 Class A ordinary shares subject to possible redemption.

Class B Ordinary Shares — The Company is authorized to issue a total of 20,000,000 Class B ordinary shares at par value of $0.0001 each. On April 8, 2024, the Company issued 5,750,000 Class B ordinary shares to the Sponsor for $25,000, or approximately $0.004 per share. As of December 31, 2024, there were 5,750,000 Class B ordinary shares issued and outstanding.

The founder shares will automatically convert into Class A ordinary shares concurrently with or immediately following the consummation of the initial Business Combination or earlier at the option of the holder on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and subject to further adjustment as provided herein. In the case that additional Class A ordinary shares, or any other equity-linked securities, are issued or deemed issued in excess of the amounts sold in this offering and related to or in connection with the closing of the initial Business Combination, the ratio at which Class B ordinary shares convert into Class A ordinary shares will be adjusted (unless the holders of a majority of the outstanding Class B ordinary shares agree to waive such adjustment with respect to any such issuance or deemed issuance) so that the number of Class A ordinary shares issuable upon conversion of all Class B ordinary shares will equal, in the aggregate, 20% of the sum of (i) the total number of all Class A ordinary shares outstanding upon the completion of this offering (including any Class A ordinary shares issued pursuant to the underwriters’ over-allotment option and excluding the Class A ordinary shares underlying the private placement warrants issued to the sponsor), plus (ii) all Class A ordinary shares and equity-linked securities issued or deemed issued, in connection with the closing of the initial Business Combination (excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial Business Combination and any private placement-equivalent warrants issued to the Sponsor or any of its affiliates or to the Company’s officers or directors upon conversion of working capital loans) minus (iii) any redemptions of Class A ordinary shares by public shareholders in connection with an initial Business Combination; provided that such conversion of founder shares will never occur on a less than one-for-one basis.

Holders of record of the Company’s Class A ordinary shares and Class B ordinary shares are entitled to one vote for each share held on all matters to be voted on by shareholders. Unless specified in the amended and restated memorandum and articles of association or as required by the Companies Act or stock exchange rules, an ordinary resolution under Cayman Islands law and the amended and restated memorandum and articles of association, which requires the affirmative vote of at least a majority of the votes cast by such shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the applicable general meeting of the Company is generally required to approve any matter voted on by shareholders. Approval of certain actions requires a special resolution under Cayman Islands law, which (except as specified below) requires the affirmative vote of at least two-thirds of the votes cast by such shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the applicable general meeting, and pursuant to the amended and restated memorandum and articles of association, such actions include amending the amended and restated memorandum and articles of association and approving a statutory merger or consolidation with another the company. There is no cumulative voting with respect to the appointment of directors, meaning, following the initial Business Combination, the holders of more than 50% of the ordinary shares voted for the appointment of directors can elect all of the directors. Prior to the consummation of the initial Business Combination, only holders of the Class B ordinary shares will (i) have the right to vote on the appointment and removal of directors and (ii) be entitled to vote on continuing the company in a jurisdiction outside the Cayman Islands (including any special resolution required

to amend the constitutional documents or to adopt new constitutional documents, in each case, as a result of the approving a transfer by way of continuation in a jurisdiction outside the Cayman Islands). Holders of the Class A ordinary shares will not be entitled to vote on these matters during such time. These provisions of the amended and restated memorandum and articles of association may only be amended if approved by a special resolution passed by the affirmative vote of at least 90% (or, where such amendment is proposed in respect of the consummation of the initial Business Combination, two-thirds) of the votes cast by such shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the applicable general meeting of the Company.

- Definition

The entire disclosure for equity.

+ References

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+ Details

S-K 1604(a)(3) De-SPAC Forepart, Compensation - New Terrestrial [Member]	6 Months Ended
	Jun. 30, 2025 USD ($) $ / shares shares
Common Shares [Member]
De-SPAC Forepart, Sponsor Compensation [Line Items]
De-SPAC Forepart, Securities Issued or To Be Issued, Shares	5,675,000
De-SPAC Forepart, Price Paid or to be Paid for Securities, Total Amount (in Dollars) \| $	$ 24,700
Warrants [Member]
De-SPAC Forepart, Sponsor Compensation [Line Items]
De-SPAC Forepart, Securities Issued or To Be Issued, Shares	4,275,000
Private Placement Warrant [Member]
De-SPAC Forepart, Sponsor Compensation [Line Items]
De-SPAC Forepart, Securities Issued or To Be Issued, Shares	151,970,541
De-SPAC Forepart, Price Paid or to be Paid for Securities, Total Amount (in Dollars) \| $	$ 4,275,000
De-SPAC Forepart, Price Paid or to be Paid for Securities, Per Share (in Dollars per share) \| $ / shares	$ 1

Fair Value Measurements - Schedule of Market Assumptions used in the Valuation of the Public Warrants (Details)	Jun. 30, 2025	Mar. 26, 2025	Aug. 19, 2024
Underlying share price [Member]
Schedule of Market Assumptions used in the Valuation of the Public Warrants [Line Items]
Fair Value Measurement Input	11.1	10.8	9.98
Exercise price [Member]
Schedule of Market Assumptions used in the Valuation of the Public Warrants [Line Items]
Fair Value Measurement Input			11.5
Term (years) [Member]
Schedule of Market Assumptions used in the Valuation of the Public Warrants [Line Items]
Fair Value Measurement Input	0.25	0.42	7
Risk-free rate [Member]
Schedule of Market Assumptions used in the Valuation of the Public Warrants [Line Items]
Fair Value Measurement Input	4.41	4.28	3.78
Volatility [Member]
Schedule of Market Assumptions used in the Valuation of the Public Warrants [Line Items]
Fair Value Measurement Input	28.82	10.73	9

Description of Organization and Business Operations

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Description of Organization and Business Operations [Abstract]

DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

The Company has a wholly owned subsidiary that was created on March 4, 2025, AKOM Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of the Company (“Merger Sub”). The transactions contemplated by the Merger Agreement are intended to serve as the Company’s initial Business Combination. See Note 6 for further information.

The Company has also entered into subscription agreements (collectively, the “PIPE Subscription Agreements”), each dated as of March 26, 2025, with certain investors (collectively, the “PIPE Investors”), pursuant to which, among other things, the Company has agreed to issue and sell, in private placements to close immediately prior to or substantially concurrently with the Closing, an aggregate of 5,000,000 shares of Domesticated Common Stock for a purchase price of $10.00 per share (the “PIPE Financing”). The PIPE Investors are permitted, under the PIPE Subscription Agreements, to satisfy their commitments thereunder if they hold shares of Domesticated Common Stock that qualify as Non-Redeemed Shares (as defined in the PIPE Subscription Agreements), subject to certain conditions and restrictions set forth in the PIPE Subscription Agreements (see Note 6 for details).

As of June 30, 2025, the Company had not commenced any operations. All activity for the period from April 4, 2024 (inception) through June 30, 2025 relates to the Company’s formation and the initial public offering (“Initial Public Offering”), which is described below. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the earliest. The Company generates non-operating income in the form of interest income from the proceeds derived from the Initial Public Offering. The Company has selected December 31 as its fiscal year end.

The registration statement for the Company’s Initial Public Offering was declared effective on August 15, 2024. On August 19, 2024, the Company consummated the Initial Public Offering of 23,000,000 units (the “Units” and, with respect to the shares of Class A ordinary shares included in the Units being offered, the “Public Shares”), which includes the full exercise by the underwriter of its over-allotment option in the amount of 3,000,000 Units, at $10.00 per Unit, generating gross proceeds of $230,000,000, which is described in Note 3.

Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of an aggregate of 6,850,000 warrants (the “Private Placement Warrants”) at a price of $1.00 per Private Placement Warrant, in a private placement to the Company’s sponsor, HCM Investor Holdings II, LLC (the “Sponsor”), and Cantor Fitzgerald & Co., the representative of the underwriter of the initial Public Offering, generating gross proceeds of $6,850,000, which is described in Note 4.

Transaction costs amounted to $15,396,014, consisting of $4,000,000 of cash underwriting fee, $10,720,000 of deferred underwriting fee (see additional discussion in Note 6), and $676,014 of other offering costs.

The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the Private Placement Warrants, although substantially all of the net proceeds are intended to be generally applied toward consummating a Business Combination (less deferred underwriting commissions).

The Company’s Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80% of the net balance in the Trust Account (as defined below) (excluding the amount of deferred underwriting discounts held and taxes payable on the income earned on the Trust Account) at the time of the signing an agreement to enter into a Business Combination. However, the Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act of 1940, as amended (the “Investment Company Act”). There is no assurance that the Company will be able to successfully effect a Business Combination.

Following the closing of the Initial Public Offering, on August 19, 2024, an amount of $231,150,000 ($10.05 per Unit) from the net proceeds of the sale of the Units and the sale of the Private Placement Warrants was placed in the trust account (the “Trust Account”), with Continental Stock Transfer & Trust Company acting as trustee and will be invested in U.S. government treasury obligations with a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 under the Investment Company Act, which invest only in direct U.S. government treasury obligations; the holding of these assets in this form is intended to be temporary and for the sole purpose of facilitating the intended business combination. To mitigate the risk that might be deemed to be an investment company for purposes of the Investment Company Act, which risk increases the longer that the Company holds investments in the Trust Account, the Company may, at any time (based on management team’s ongoing assessment of all factors related to the potential status under the Investment Company Act), instruct the trustee to liquidate the investments held in the Trust Account and instead to hold the funds in the Trust Account in cash or in an interest bearing demand deposit account at a bank. Nevertheless, the Company may be considered to be operating as an investment company and if the Company is deemed as such compliance with additional regulatory burdens would require additional expenses for which the Company has not allotted funds and would severely hinder the Company’s ability to compete a business combination. Except with respect to interest earned on the funds held in the Trust Account that may be released to the Company to pay its taxes, if any, the proceeds from the Initial Public Offering and the sale of the Private Placement Warrants will not be released from the Trust Account until the earliest of (i) the completion of the Company’s initial Business Combination, (ii) the redemption of the Company’s public shares if the Company is unable to complete the initial Business Combination within 24 months from the closing of the Initial Public Offering or by such earlier liquidation date as the board of directors may approve (the “Completion Window”), subject to applicable law, or (iii) the redemption of the Company’s public shares properly submitted in connection with a shareholder vote to amend the Company’s amended and restated memorandum and articles of association to (A) modify the substance or timing of the Company’s obligation to allow redemption in connection with the initial Business Combination or to redeem 100% of the Company’s public shares if the Company has not consummated an initial Business Combination within the Completion Window or (B) with respect to any other material provisions relating to shareholders’ rights or pre-initial Business Combination activity. The proceeds deposited in the Trust Account could become subject to the claims of the Company’s creditors, if any, which could have priority over the claims of the Company’s public shareholders.

The Company will provide the Company’s public shareholders with the opportunity to redeem all or a portion of their public shares upon the completion of the initial Business Combination either (i) in connection with a general meeting called to approve the initial Business Combination or (ii) without a shareholder vote by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a proposed initial Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The public shareholders will be entitled to redeem their shares at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account calculated as of two business days prior to the consummation of the initial Business Combination, including interest earned on the funds held in the Trust Account (less taxes payable), divided by the number of then outstanding public shares, subject to the limitations. The amount in the Trust Account is initially anticipated to be $10.05 per public share.

The ordinary shares subject to redemption were recorded at a redemption value and classified as temporary equity upon the completion of the Initial Public Offering, in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 480, “Distinguishing Liabilities from Equity.” In such case, if the Company seeks shareholder approval, a majority of the issued and outstanding shares voted are voted in favor of the Business Combination.

The Company will have only the duration of the Completion Window to complete the initial Business Combination. However, if the Company is unable to complete its initial Business Combination within the Completion Window, the Company will as promptly as reasonably possible but not more than ten business days thereafter, redeem the public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account (less taxes payable and up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding public shares, which redemption will constitute full and complete payment for the public shares and completely extinguish public shareholders’ rights as shareholders (including the right to receive further liquidation or other distributions, if any), subject to the Company’s obligations under Cayman Islands law to provide for claims of creditors and subject to the other requirements of applicable law.

The Sponsor, officers and directors have entered into a letter agreement with the Company, pursuant to which they have agreed to (i) waive their redemption rights with respect to their founder shares and public shares in connection with the completion of the initial Business Combination; (ii) waive their redemption rights with respect to their founder shares and public shares in connection with a shareholder vote to approve an amendment to the Company’s amended and restated memorandum and articles of association; (iii) waive their rights to liquidating distributions from the Trust Account with respect to their founder shares if the Company fails to complete the initial Business Combination within the Completion Window, although they will be entitled to liquidating distributions from the Trust Account with respect to any public shares they hold if the Company fails to complete the initial Business Combination within the Completion Window and to liquidating distributions from assets outside the Trust Account; and (iv) vote any founder shares held by them and any public shares purchased during or after the Initial Public Offering (including in open market and privately negotiated transactions, aside from shares they may purchase in compliance with the requirements of Rule 14e-5 under the Exchange Act, which would not be voted in favor of approving the Business Combination) in favor of the initial Business Combination.

The Company’s Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.05 per public share and (ii) the actual amount per public share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.05 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriter of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). However, the Company has not asked the Sponsor

to reserve for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and the Company believes that the Sponsor’s only assets are securities of the Company. Therefore, the Company cannot assure that the Sponsor would be able to satisfy those obligations.

Liquidity and Going Concern

As of June 30, 2025, the Company had $124,083 in its operating bank account and working capital deficit of $2,185,772.

The Company initially has until August 19, 2026 to consummate the initial Business Combination (assume no extensions). If the Company does not complete a Business Combination, the Company will trigger an automatic winding up, dissolution and liquidation pursuant to the terms of the Amended and Restated Memorandum and Articles of Association. Notwithstanding management’s belief that the Company would have sufficient funds to execute its business strategy, there is a possibility that the business combination might not happen within the 24-month period from the date of the Initial Public Offering.

In connection with the Company’s assessment of going concern considerations in accordance with ASC 205-40, “Going Concern”, as of June 30, 2025, the Company may need to raise additional capital through loans or additional investments from its Sponsor, shareholders, officers, directors, or third parties. The Company’s officers, directors and Sponsor may, but are not obligated to, loan the Company funds, from time to time or at any time, in whatever amount they deem reasonable in their sole discretion, to meet the Company’s working capital needs. Accordingly, the Company may not be able to obtain additional financing. If the Company is unable to raise additional capital, it may be required to take additional measures to conserve liquidity, which could include, but not necessarily be limited to, curtailing operations, suspending the pursuit of a potential transaction, and reducing overhead expenses. The Company cannot provide any assurance that new financing will be available to it on commercially acceptable terms, if at all.

Management plans to address this uncertainty through a Business Combination. If a Business Combination is not consummated by the end of the Combination Period, currently August 19, 2026, there will be mandatory liquidation and subsequent dissolution of the Company. Management has determined that the liquidity condition raises substantial doubt about the Company’s ability to continue as a going concern. No adjustments have been made to the carrying amounts of assets or liabilities should the Company be required to liquidate after the Combination Period. The Company intends to complete the initial Business Combination before the end of the Combination Period. However, there can be no assurance that the Company will be able to consummate any Business Combination by the end of the Combination Period.

NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

HCM II Acquisition Corp. (the “Company”) is a blank check company incorporated as a Cayman Islands exempted corporation on April 4, 2024. The Company was incorporated for the purpose of effecting a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or similar Business Combination with one or more businesses (the “Business Combination”). As of December 31, 2024, the Company has not selected any specific Business Combination target, and the Company has not, nor has anyone on its behalf, engaged in any substantive discussions, directly or indirectly, with any Business Combination target with respect to an initial Business Combination with the Company.

As of December 31, 2024, the Company had not commenced any operations. All activity for the period from April 4, 2024 (inception) through December 31, 2024 relates to the Company’s formation and the initial public offering (“Initial Public Offering”), which is described below. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the earliest. The Company generates non-operating income in the form of interest income from the proceeds derived from the Initial Public Offering. The Company has selected December 31 as its fiscal year end.

The registration statement for the Company’s Initial Public Offering was declared effective on August 15, 2024. On August 19, 2024, the Company consummated the Initial Public Offering of 23,000,000 units (the “Units” and, with respect to the shares of Class A ordinary shares included in the Units being offered, the “Public Shares”), which includes the full exercise by the underwriters of their over-allotment option in the amount of 3,000,000 Units, at $10.00 per Unit, generating gross proceeds of $230,000,000, which is described in Note 4.

Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of an aggregate of 6,850,000 Private Placement Warrants at a price of $1.00 per Private Placement Warrant, in a private placement to the Company’s sponsor, HCM Investor Holdings II, LLC (the “Sponsor”), and Cantor Fitzgerald & Co., the representative of the underwriters of the initial Public Offering, generating gross proceeds of $6,850,000, which is described in Note 5.

Transaction costs amounted to $15,396,014, consisting of $4,000,000 of cash underwriting fee, $10,720,000 of deferred underwriting fee (see additional discussion in Note 7), and $676,014 of other offering costs.

related to the potential status under the Investment Company Act), instruct the trustee to liquidate the investments held in the Trust Account and instead to hold the funds in the Trust Account in cash or in an interest bearing demand deposit account at a bank. Nevertheless, the Company may be considered to be operating as an investment company and if the Company is deemed as such compliance with additional regulatory burdens would require additional expenses for which the Company has not allotted funds and would severely hinder the Company’s ability to compete a business combination. Except with respect to interest earned on the funds held in the Trust Account that may be released to the Company to pay its taxes, if any, the proceeds from the Initial Public Offering and the sale of the Private Placement Warrants will not be released from the Trust Account until the earliest of (i) the completion of the Company’s initial Business Combination, (ii) the redemption of the Company’s public shares if the Company is unable to complete the initial Business Combination within 24 months from the closing of the Initial Public Offering or by such earlier liquidation date as the board of directors may approve (the “Completion Window”), subject to applicable law, or (iii) the redemption of the Company’s public shares properly submitted in connection with a shareholder vote to amend the Company’s amended and restated memorandum and articles of association to (A) modify the substance or timing of the Company’s obligation to allow redemption in connection with the initial Business Combination or to redeem 100% of the Company’s public shares if the Company has not consummated an initial Business Combination within the Completion Window or (B) with respect to any other material provisions relating to shareholders’ rights or pre-initial Business Combination activity. The proceeds deposited in the Trust Account could become subject to the claims of the Company’s creditors, if any, which could have priority over the claims of the Company’s public shareholders.

The Company will provide the Company’s public shareholders with the opportunity to redeem all or a portion of their public shares upon the completion of the initial Business Combination either (i) in connection with a general meeting called to approve the initial Business Combination or (ii) without a shareholder vote by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a proposed initial Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The public shareholders will be entitled to redeem their shares at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account calculated as of two (2) Business Days prior to the consummation of the initial Business Combination, including interest earned on the funds held in the Trust Account (less taxes payable), divided by the number of then outstanding public shares, subject to the limitations. The amount in the Trust Account is initially anticipated to be $10.05 per public share.

The Company will have only the duration of the Completion Window to complete the initial Business Combination. However, if the Company is unable to complete its initial Business Combination within the Completion Window, the Company will as promptly as reasonably possible but not more than ten (10) Business Days thereafter, redeem the public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account (less taxes payable and up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding public shares, which redemption will constitute full and complete payment for the public shares and completely extinguish public shareholders’ rights as shareholders (including the right to receive further liquidation or other distributions, if any), subject to the Company’s obligations under Cayman Islands law to provide for claims of creditors and subject to the other requirements of applicable law.

from the Trust Account with respect to their founder shares if the Company fails to complete the initial Business Combination within the Completion Window, although they will be entitled to liquidating distributions from the Trust Account with respect to any public shares they hold if the Company fails to complete the initial Business Combination within the Completion Window and to liquidating distributions from assets outside the trust account; and (iv) vote any founder shares held by them and any public shares purchased during or after the Initial Public Offering (including in open market and privately negotiated transactions, aside from shares they may purchase in compliance with the requirements of Rule 14e-5 under the Exchange Act, which would not be voted in favor of approving the Business Combination) in favor of the initial Business Combination.

The Company’s Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.05 per public share and (ii) the actual amount per public share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.05 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity obligations to the IPO’s underwriters for certain liabilities, including liabilities under the Securities Act. However, the Company has not asked the Sponsor to reserve for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and the Company believes that the Sponsor’s only assets are securities of the Company. Therefore, the Company cannot assure that the Sponsor would be able to satisfy those obligations.

Liquidity and Going Concern

As of December 31, 2024, the Company had $668,089 in its operating bank account and working capital of $361,543.

The Company initially has until August 19, 2026 to consummate the initial Business Combination (assuming no extensions). If the Company does not complete a Business Combination, the Company will trigger an automatic winding up, dissolution and liquidation pursuant to the terms of the Amended and Restated Memorandum and Articles of Association. Notwithstanding management’s belief that the Company would have sufficient funds to execute its business strategy, there is a possibility that business combination might not happen within the 24-month period from the date of the auditors’ report.

In connection with the Company’s assessment of going concern considerations in accordance with ASC 205-40, “Going Concern”, as of December 31, 2024, the Company may need to raise additional capital through loans or additional investments from its Sponsor, stockholders, officers, directors, or third parties. The Company’s officers, directors and Sponsor may, but are not obligated to, loan the Company funds, from time to time or at any time, in whatever amount they deem reasonable in their sole discretion, to meet the Company’s working capital needs. Accordingly, the Company may not be able to obtain additional financing. If the Company is unable to raise additional capital, it may be required to take additional measures to conserve liquidity, which could include, but not necessarily be limited to, curtailing operations, suspending the pursuit of a potential transaction, and reducing overhead expenses. The Company cannot provide any assurance that new financing will be available to it on commercially acceptable terms, if at all.

S-K 1606, De-SPAC Board Determination

Sep. 23, 2025

De-SPAC, Board Determination, Factors Considered [Line Items]

De-SPAC, Board Determination Disclosure [Text Block]

In reaching its decision to approve the Business Combination Proposal and resolving to recommend that Terrestrial Stockholders approve the Business Combination Proposal, the Terrestrial Board consulted with Terrestrial Energy’s management, as well as its legal counsel and other advisors. The Terrestrial Board considered a variety of factors in connection with its evaluation and approval of the Business Combination and the matters related to the Business Combination.

In light of the number and variety of factors considered in connection with its evaluation of the Business Combination, the Terrestrial Board did not consider it practicable to, and did not attempt to, quantify or otherwise assign relative weights to the specific factors that it considered in reaching its determination and supporting its decision. The Terrestrial Board viewed its decision as being based on all of the information available and the factors presented to and considered by it. In addition, individual directors may have given different weight to different factors in their evaluation of the Business Combination. The Terrestrial Board considered a number of factors pertaining to the Business Combination as generally supporting its decision to enter into the Business Combination Agreement and the transactions contemplated thereby, including, but not limited to, the following material factors:

• Optimal Path to Support Growth. The Terrestrial Board determined, after a thorough review of other strategic alternatives potentially available to Terrestrial, that the proposed Business Combination represents a better opportunity for Terrestrial Energy to support its long-term growth and create value for its stockholders, as compared to other potential strategic alternatives with other partners and the possibility of, and benefits and risks associated with, continuing to operate Terrestrial as an independent, stand-alone entity, which the Terrestrial Board believed would not deliver comparable benefits to those that could be achieved in the proposed Business Combination.

• Negotiated Transaction. The Terrestrial Board considered the terms and conditions of the Transaction Agreements and the transactions contemplated thereby, including but not limited to, each party’s representations, warranties and covenants, the conditions to each party’s obligation to consummate the Business Combination and the termination provisions, as well as the strong commitment by both Terrestrial Energy and HCM II to consummation the transactions contemplated by the Transaction Agreements.

• Access to Capital. The Terrestrial Board considered the current economic, industry and market conditions affecting Terrestrial Energy, Terrestrial Energy’s projected financial results and cash flows, Terrestrial Energy’s prospects as a private entity and the needs of Terrestrial Energy to obtain substantial additional financing in the future and the cost of alternative means of raising capital, and it expected that the proposed Business Combination would be a more time- and cost-effective means to access capital than other options considered.

• Board Composition. The Terrestrial Board considered that the New Terrestrial Board will consist of no less than five directors, including one director to be designated by HCM II, the Chief Executive Officer of New Terrestrial Energy, and the remaining directors to be designated by Terrestrial Energy, such that a majority of the members of the New Terrestrial Board will be independent under applicable law and the rules and regulations of Nasdaq.

• Route to Becoming a Publicly Traded Company. The Terrestrial Board considered that becoming a public company would be the best way for Terrestrial Energy to have access to long-term sources of available capital and would aid Terrestrial Energy in executing its long-term strategic plan. The Terrestrial Board considered potential alternatives to becoming a publicly traded company from a business combination with a SPAC, and the potential advantages the Business Combination affords, including the expected cost to becoming a publicly traded company from a business combination with a SPAC compared to other ways of becoming a publicly traded company.

• Potential Liquidity Opportunity for Long Term Holders. The Terrestrial Board also considered the fact that Terrestrial Energy is a private company with limited opportunities for liquidity for its holders outside of a sale of Terrestrial Energy. The Terrestrial Board believed that the Business Combination, and the potential listing of New Terrestrial Energy’s shares on Nasdaq, provides long term holders of Terrestrial Energy equity interests with an opportunity, subject to the expiration of any applicable lockup and transfer restrictions, to sell all or a portion of their resulting New Terrestrial Common Shares and thus diversify their holdings.

The Terrestrial Board also considered a variety of uncertainties and risks and other potentially negative factors concerning the Business Combination (which are more fully described in the “Risk Factors” section of this proxy statement/prospectus), including, but not limited to, the following:

• Potential Inability to Complete the Business Combination. The Terrestrial Board considered the risk that the business combination might not be consummated in a timely manner, or at all, due to a lack of stockholder approval or failure to satisfy various other conditions, including without limitation (i) the condition to closing the Business Combination that the Available Closing SPAC Cash will not be less than $150 million, (ii) the condition to closing the PIPE Financing that there be a minimum of $75 million of cash remaining in the Trust Account (excluding the value of all shares held in the Trust Account by the parties to the PIPE Subscription Agreements) after any redemptions by the HCM II’s public shareholders and before any other payments or distributions (other than in respect of any redemptions), and (iii) condition to closing the PIPE Financing that the volume weighted average closing price NLR ETF be greater than or equal to $63.00 for the 20 trading days immediately preceding the date that is seven Business Days prior the Closing Date.

• Redemption Risk. The potential that a significant number of Public Shareholders elect to redeem their Public Shares prior to the consummation of the Business Combination and pursuant to the Existing Charter, which would potentially make the Business Combination more difficult to complete and reduce the cash available to New Terrestrial Energy to fund its business plan. However, even in the event that a significant number of Public Shareholders elect to redeem their shares, this redemption would not prevent the consummation of the Business Combination.

• Fees and Expenses. The Terrestrial Board considered the fees and expenses associated with completing the Business Combination.

• Diversion of Management and Employee Attention. The Terrestrial Board considered the potential for diversion of Terrestrial Energy’s management and employee attention and resources during the period prior to the completion of the Business Combination and the potential negative effects thereof on Terrestrial Energy’s business.

• ExchangeCo Recapitalization. The Board took into consideration the ExchangeCo Recapitialization intended to provide holders of Exchangeable Shares of ExchangeCo the ability to defer Canadian income taxes in connection with the Business Combination and the increased complexity and expense involved in the transaction as a result thereof.

• Interests of Certain Persons. The Terrestrial Board also considered the fact that Terrestrial Energy’s officers and directors may have interests in the Business Combination that are different from or in addition to (and which may conflict with) the interests of the Public Shareholders (see “Interests of Terrestrial Energy Directors and Officers in the Business Combination”).

The Terrestrial Board ultimately concluded that, in the aggregate, the potential benefits of the Business Combination outweighed the potential risks or negative consequences and that the Business Combination is in the best interests of Terrestrial Energy and its stockholders.

Fair Value Measurements - Schedule of Changes in the Fair Value (Details) - Forward Contracts [Member] - USD ($)		3 Months Ended	6 Months Ended
	Mar. 31, 2025	Jun. 30, 2025	Jun. 30, 2025
Schedule of Changes in The Fair Value [Line Items]
Fair value beginning balance	$ 893,425	$ 669,732
Change in fair value	(223,693)		$ 387,392
Fair value ending balance	$ 669,732	$ 1,057,124	$ 1,057,124

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Current assets
Cash	$ 124,083	$ 668,089
Other receivable		41,250
Due from Sponsor	4,466	4,466
Short-term prepaid insurance	90,250	90,250
Prepaid expenses	70,982	16,112
Total current assets	289,781	820,167
Long-term prepaid insurance	7,521	52,646
Marketable securities held in Trust Account	240,134,175	235,193,585
Total Assets	240,431,477	236,066,398
Current Liabilities
Accrued expenses	2,475,553	458,624
Total current liabilities	2,475,553	458,624
Forward purchase agreement liability	1,057,124
Deferred underwriting fee	10,720,000	10,720,000
Total Liabilities	14,252,677	11,178,624
Commitments and Contingencies (Note 6)
Class A ordinary shares subject to possible redemption	240,134,175	235,193,585
Shareholders’ Deficit
Preference shares
Additional paid-in capital
Accumulated deficit	(13,955,950)	(10,306,386)
Total Shareholders’ Deficit	(13,955,375)	(10,305,811)
Total Liabilities and Shareholders’ Deficit	240,431,477	236,066,398
Class A Ordinary Shares
Shareholders’ Deficit
Ordinary shares, value
Class B Ordinary Shares
Shareholders’ Deficit
Ordinary shares, value	$ 575	$ 575

Description of Organization and Business Operations (Details) - USD ($)			6 Months Ended	9 Months Ended
	Mar. 26, 2025	Aug. 19, 2024	Jun. 30, 2025	Dec. 31, 2024
Description of Organization and Business Operations [Line Items]
Redemption price	$ 925,000,000		$ 925,000,000
Inception period			April 4, 2024 (inception) through June 30, 2025	April 4, 2024 (inception) through December 31, 2024
Gross proceeds from initial public offering				$ 226,000,000
Proceeds from issuance of private placement				6,850,000
Deferred underwriting fee			$ 10,720,000	$ 10,720,000
Percentage of fair market value			80.00%	80.00%
Ownership percentage			50.00%	50.00%
Obligation maturity term			185 days	185 days
Period to complete business combination			24 months	24 months
Shares redemption obligation percentage			100.00%	100.00%
Period to redeem public shares			10 days	10 days
Interest to pay dissolution expenses			$ 100,000	$ 100,000
Public price (in Dollars per share)			$ 10.05	$ 10.05
Cash in operating bank			$ 124,083	$ 668,089
Working capital			$ 2,185,772	$ 361,543
Private Placement Warrants [Member]
Description of Organization and Business Operations [Line Items]
Sale of stock units (in Shares)			6,850,000	6,850,000
Sale of stock price per share (in Dollars per share)			$ 1	$ 1
Proceeds from issuance of private placement			$ 6,850,000	$ 6,850,000
Business Combination [Member]
Description of Organization and Business Operations [Line Items]
Cash deposited in trust account per unit (in Dollars per share)			$ 10.05	$ 10.05
Cantor Fitzgerald & Co.[Member] \| Private Placement Warrants [Member]
Description of Organization and Business Operations [Line Items]
Proceeds from issuance of private placement			$ 6,850,000	$ 6,850,000
Class A Ordinary Shares [Member]
Description of Organization and Business Operations [Line Items]
Sale of stock price per share (in Dollars per share)			$ 0.0001
Public price (in Dollars per share)			$ 12	$ 12
Private Investment in Public Equity [Member] \| Common Stock [Member]
Description of Organization and Business Operations [Line Items]
Domesticated common stock (in Shares)	5,000,000		5,000,000
Unit price per share (in Dollars per share)	$ 10		$ 10
IPO [Member]
Description of Organization and Business Operations [Line Items]
Unit price per share (in Dollars per share)		$ 10
Number of founder shares purchased by sponsor (in Shares)		23,000,000
Sale of stock price per share (in Dollars per share)		$ 10
Transaction costs			$ 15,396,014	$ 15,396,014
Cash underwriting fee			4,000,000	4,000,000
Deferred underwriting fee			4,000,000	4,000,000
Other offering costs			$ 676,014	$ 676,014
IPO [Member] \| Private Placement Warrants [Member]
Description of Organization and Business Operations [Line Items]
Gross proceeds from initial public offering		$ 231,150,000
Sale of stock price per share (in Dollars per share)		$ 10.05
IPO [Member] \| Business Combination [Member] \| Private Placement Warrants [Member]
Description of Organization and Business Operations [Line Items]
Public price (in Dollars per share)			$ 10.05	$ 10.05
IPO [Member] \| Class A Ordinary Shares [Member]
Description of Organization and Business Operations [Line Items]
Unit price per share (in Dollars per share)		$ 10
Number of founder shares purchased by sponsor (in Shares)		23,000,000
Gross proceeds from initial public offering		$ 230,000,000
Sale of stock price per share (in Dollars per share)		$ 10
Over-Allotment Option [Member]
Description of Organization and Business Operations [Line Items]
Domesticated common stock (in Shares)		3,000,000	3,000,000
Number of founder shares purchased by sponsor (in Shares)		3,000,000		3,000,000
Over-Allotment Option [Member] \| Class A Ordinary Shares [Member]
Description of Organization and Business Operations [Line Items]
Number of founder shares purchased by sponsor (in Shares)		3,000,000

Initial Public Offering

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Class of Stock Disclosures [Abstract]

INITIAL PUBLIC OFFERING

NOTE 3. INITIAL PUBLIC OFFERING

Pursuant to the Initial Public Offering, on August 19, 2024 the Company sold 23,000,000 Units, which includes the full exercise by the underwriter of its over-allotment option in the amount of 3,000,000 Units, at a price of $10.00 per Unit. Each Unit consists of one Class A ordinary share and one-half of one redeemable Public Warrant. Each Public Warrant entitles the holder to purchase one Class A ordinary share at a price of $11.50 per share, subject to adjustment (see Note 4). Each warrant will become exercisable 30 days after the completion of the initial Business Combination and will expire five years after the completion of the initial Business Combination, or earlier upon redemption or liquidation.

Warrants — As of June 30, 2025 and December 31, 2024, there were 18,350,000 warrants outstanding, including 11,500,000 Public Warrants and 6,850,000 Private Placement Warrants. Each whole warrant entitles the holder to purchase one Class A ordinary share at a price of $11.50 per share, subject to adjustment as discussed herein. The warrants cannot be exercised until 30 days after the completion of the initial Business Combination, and will expire at 5:00 p.m., New York City time, five years after the completion of the initial Business Combination or earlier upon redemption or liquidation.

On October 10, 2024, the Company announced that, commencing on October 10, 2024, the holders of units issued in its Initial Public Offering may elect to separately trade shares of Class A ordinary shares and warrants included in the Units. No fractional warrants will be issued upon separation of the Units and only whole warrants will trade. The Units not separated will continue to trade on the Nasdaq under the symbol “HONDU.” Shares of Class A ordinary shares and the warrants are expected to trade on the Nasdaq under the symbols “HOND” and “HONDW,” respectively.

The Company will not be obligated to deliver any Class A ordinary shares pursuant to the exercise of a warrant and will have no obligation to settle such warrant exercise unless a registration statement under the Securities Act with respect to the Class A ordinary shares underlying the warrants is then effective and a prospectus relating thereto is current. No warrant will be exercisable and the Company will not be obligated to issue a Class A ordinary share upon exercise of a warrant unless the Class A ordinary share issuable upon such warrant exercise has been registered, qualified or deemed to be exempt under the securities laws of the state of residence of the registered holder of the warrants. In the event that the conditions in the two immediately preceding sentences are not satisfied with respect to a warrant, the holder of such warrant will not be entitled to exercise such warrant and such warrant may have no value and expire worthless. In no event will the Company be required to net cash settle any warrant. In the event that a registration statement is not effective for the exercised warrants, the purchaser of a unit containing such warrant will have paid the full purchase price for the unit solely for the Class A ordinary share underlying such unit.

Under the terms of the warrant agreement, the Company has agreed that, as soon as practicable, but in no event later than 20 business days, after the closing of its Business Combination, it will use commercially reasonable efforts to file with the SEC a post-effective amendment to the registration statement for the Initial Public Offering or a new registration statement covering the registration under the Securities Act of the Class A ordinary shares issuable upon exercise of the warrants and thereafter will use its commercially reasonable efforts to cause the same to become effective within 60 business days following the Company’s initial Business Combination and to maintain a current prospectus relating to the Class A ordinary shares issuable upon exercise of the warrants until the expiration of the warrants in accordance with the provisions of the warrant agreement. If a registration statement covering the Class A ordinary shares issuable upon exercise of the warrants is not effective by the sixtieth (60th) business day after the closing of the initial Business Combination, warrant holders may, until such time as there is an effective registration statement and during any period when the Company will have failed to maintain an effective registration statement, exercise warrants on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act or another exemption. Notwithstanding the above, if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, require holders of public warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event the Company so elects, the Company will not be required to file or maintain in effect a registration statement, and in the event the Company does not so elect, the Company will use its commercially reasonable efforts to register or qualify the shares under applicable blue sky laws to the extent an exemption is not available.

If the holders exercise their public warrants on a cashless basis, they would pay the warrant exercise price by surrendering the warrants for that number of Class A ordinary shares equal to the quotient obtained by dividing (x) the product of the number of Class A ordinary shares underlying the warrants, multiplied by the excess of the “fair market value” of the Class A ordinary shares over the exercise price of the warrants by (y) the fair market value. The “fair market value” is the average reported closing price of the Class A ordinary shares for the 10 trading days ending on the third trading day prior to the date on which the notice of exercise is received by the warrant agent or on which the notice of redemption is sent to the holders of warrants, as applicable.

Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $18.00: The Company may redeem the outstanding warrants:

Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described herein with respect to the private placement warrants):

• in whole and not in part;

• at a price of $0.01 per warrant;

• upon a minimum of 30 days’ prior written notice of redemption (the “30-day redemption period”); and

• if, and only if, the closing price of the Class A ordinary shares equals or exceeds $18.00 per share (as adjusted for adjustments to the number of shares issuable upon exercise or the exercise price of a warrant) for any 20 trading days within a 30-trading day period commencing at least 30 days after completion of the initial business combination and ending three business days before the Company sends the notice of redemption to the warrant holders.

Additionally, if the number of outstanding Class A ordinary shares is increased by a share capitalization payable in Class A ordinary shares, or by a subdivision of ordinary shares or other similar event, then, on the effective date of such share capitalization, subdivision or similar event, the number of Class A ordinary shares issuable on exercise of each warrant will be increased in proportion to such increase in the outstanding ordinary shares. A rights offering made to all or substantially all holders of ordinary shares entitling holders to purchase Class A ordinary shares at a price less than the fair market value will be deemed a share capitalization of a number of Class A ordinary shares equal to the product of (i) the number of Class A ordinary shares actually sold in such rights offering (or issuable under any other equity securities sold in such rights offering that are convertible into or exercisable for Class A ordinary shares) and (ii) the quotient of (x) the price per Class A ordinary share paid in such rights offering and (y) the fair market value. For these purposes (i) if the rights offering is for securities convertible into or exercisable for Class A ordinary shares, in determining the price payable for Class A ordinary shares, there will be taken into account any consideration received for such rights, as well as any additional amount payable upon exercise or conversion and (ii) fair market value means the volume weighted average price of Class A ordinary shares as reported during the ten (10) trading day period ending on the trading day prior to the first date on which the Class A ordinary shares trade on the applicable exchange or in the applicable market, regular way, without the right to receive such rights.

NOTE 4. INITIAL PUBLIC OFFERING

Pursuant to the Initial Public Offering, on August 19, 2024 the Company sold 23,000,000 Units, which includes the full exercise by the underwriters of their over-allotment option in the amount of 3,000,000 Units, at a price of $10.00 per Unit. Each Unit consists of one Class A ordinary share and one-half of one redeemable Public Warrant. Each Public Warrant entitles the holder to purchase one Class A ordinary share at a price of $11.50 per share, subject to adjustment (see Note 5). Each warrant will become exercisable 30 days after the completion of the initial Business Combination and will expire five years after the completion of the initial Business Combination, or earlier upon redemption or liquidation.

Warrants — As of December 31, 2024, there were 18,350,000 warrants outstanding, including 11,500,000 Public Warrants and 6,850,000 Private Placement Warrants. Each whole warrant entitles the holder to purchase one Class A ordinary share at a price of $11.50 per share, subject to adjustment as discussed herein. The warrants cannot be exercised until 30 days after the completion of the initial Business Combination, and will expire at 5:00 p.m., New York City time, five years after the completion of the initial Business Combination or earlier upon redemption or liquidation.

Under the terms of the warrant agreement, the Company has agreed that, as soon as practicable, but in no event later than twenty (20) Business Days, after the closing of its Business Combination, it will use commercially reasonable efforts to file with the SEC a post-effective amendment to the registration statement for the Initial Public Offering or a new registration statement covering the registration under the Securities Act of the Class A ordinary shares issuable upon exercise of the warrants and thereafter will use its commercially reasonable efforts to cause the same to become effective within sixty (60) Business Days following the Company’s initial Business Combination and to maintain a current prospectus relating to the Class A ordinary shares issuable upon exercise of the warrants until the expiration of the warrants in accordance with the provisions of the warrant agreement. If a registration statement covering the Class A ordinary shares issuable upon exercise of the warrants is not effective by the sixtieth (60th) Business Day after the closing of the initial Business Combination, warrant holders may, until such time as there is an effective registration statement and during any period when the Company will have failed to maintain an effective registration statement, exercise warrants on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act or another exemption. Notwithstanding the above, if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, require holders of public warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event the Company so elects, the Company will not be required to file or maintain in effect a registration statement, and in the event the Company does not so elect, the Company will use its commercially reasonable efforts to register or qualify the shares under applicable blue sky laws to the extent an exemption is not available.

If the holders exercise their public warrants on a cashless basis, they would pay the warrant exercise price by surrendering the warrants for that number of Class A ordinary shares equal to the quotient obtained by dividing (x) the product of the number of Class A ordinary shares underlying the warrants, multiplied by the excess of the “fair market value” of the Class A ordinary shares over the exercise price of the warrants by (y) the fair market value. The “fair market value” is the average reported closing price of the Class A ordinary shares for the ten (10) trading days ending on the third (3rd) trading day prior to the date on which the notice of exercise is received by the warrant agent or on which the notice of redemption is sent to the holders of warrants, as applicable.

Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $18.00: The Company may redeem the outstanding warrants:

Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described herein with respect to the private placement warrants):

• in whole and not in part;

• at a price of $0.01 per warrant;

• upon a minimum of 30 days’ prior written notice of redemption (the “30-day redemption period”); and

• if, and only if, the closing price of the Class A ordinary shares equals or exceeds $18.00 per share (as adjusted for adjustments to the number of shares issuable upon exercise or the exercise price of a warrant) for any twenty (20) trading days within a thirty (30)-trading day period commencing at least 30 days after completion of the initial business combination and ending three (3) Business Days before we send the notice of redemption to the warrant holders.

all or substantially all holders of ordinary shares entitling holders to purchase Class A ordinary shares at a price less than the fair market value will be deemed a share capitalization of a number of Class A ordinary shares equal to the product of (i) the number of Class A ordinary shares actually sold in such rights offering (or issuable under any other equity securities sold in such rights offering that are convertible into or exercisable for Class A ordinary shares) and (ii) the quotient of (x) the price per Class A ordinary share paid in such rights offering and (y) the fair market value. For these purposes (i) if the rights offering is for securities convertible into or exercisable for Class A ordinary shares, in determining the price payable for Class A ordinary shares, there will be taken into account any consideration received for such rights, as well as any additional amount payable upon exercise or conversion and (ii) fair market value means the volume weighted average price of Class A ordinary shares as reported during the ten (10) trading day period ending on the trading day prior to the first date on which the Class A ordinary shares trade on the applicable exchange or in the applicable market, regular way, without the right to receive such rights.

Segment Information (Details)	6 Months Ended	9 Months Ended
Segment Information (Details)	Jun. 30, 2025	Dec. 31, 2024
Segment Information [Abstract]
CODM managing description	The Company’s CODM has been identified as the Chief Financial Officer, who reviews the assets, operating results, and financial metrics for the Company as a whole to make decisions about allocating resources and assessing financial performance. Accordingly, management has determined that there is only one reportable segment.
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	Chief Financial Officer
One reportable segment	1	1

Fair Value Measurements (Details) - USD ($)	6 Months Ended
Fair Value Measurements (Details) - USD ($)	Jun. 30, 2025	Jun. 30, 2024
Fair Value Measurements [Abstract]
Change in fair value of forward purchase agreement liabilities	$ 163,699

Segment Information - Schedule of Net Income and Total Assets (Details) - USD ($)	3 Months Ended				6 Months Ended	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Jun. 30, 2025	Dec. 31, 2024
Schedule of Net Income and Total Assets [Line Items]
Marketable Securities held in trust account	$ 240,134,175	$ 240,134,175			$ 240,134,175	$ 235,193,585
Cash	124,083	124,083			124,083	668,089
Net income (loss)	601,027	(52,663)	$ 689,999	$ (52,663)	1,291,026	3,408,788
General and administrative expenses	1,489,307	52,663		52,663	2,592,440	634,797
Interest earned on marketable securities held in Trust Account	2,477,726				4,940,590	4,043,585
Other Operating Segment [Member]
Schedule of Net Income and Total Assets [Line Items]
Marketable Securities held in trust account	240,134,175	240,134,175			240,134,175	235,193,585
Cash	124,083	$ 124,083			$ 124,083	$ 668,089
Net income (loss)	601,027
General and administrative expenses	1,489,307
Interest earned on marketable securities held in Trust Account	$ 2,477,726

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Accounting Policies, by Policy (Policies)

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Significant Accounting Policies [Abstract]

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and in accordance with the instructions to Form 10-Q and Article 8 of Regulation S-X of the U.S. Securities and Exchange Commission (“SEC”). Certain information or footnote disclosures normally included in unaudited condensed consolidated financial statements prepared in accordance with GAAP have been condensed or omitted, pursuant to the rules and regulations of the SEC for interim financial reporting. Accordingly, they do not include all the information and footnotes necessary for a complete presentation of financial position, results of operations, or cash flows. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the financial position, operating results and cash flows for the periods presented.

The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K as filed with the SEC on March 31, 2025. The interim results for the three and six months ended June 30, 2025, are not necessarily indicative of the results to be expected for the year ending December 31, 2025 or for any future periods.

Basis of Presentation

The accompanying financial statement is presented in U.S. dollars and have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and pursuant to the accounting and disclosure rules and regulations of the Securities and Exchange Commission (the “SEC”).

Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, which was formed on March 4, 2025. All significant intercompany balances and transactions have been eliminated in consolidation.

Emerging Growth Company

The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved.

Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statements with another public company which is neither an emerging growth company nor an emerging growth company which has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.

Emerging Growth Company

Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company which is neither an emerging growth company nor an emerging growth company which has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.

Use of Estimates

The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates.

Use of Estimates

The preparation of financial statement in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates.

Cash and Cash Equivalents

The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had $124,083 and $668,089 in cash and no cash equivalents as of June 30, 2025 and December 31, 2024, respectively.

Cash and Cash Equivalents

The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had $668,089 in cash as of December 31, 2024.

Marketable Securities held in Trust Account

Marketable Securities Held in Trust Account

As of June 30, 2025 and December 31, 2024, the assets held in the Trust Account, amounting to $240,134,175 and $235,193,585, were held in a Money Market Mutual Fund, respectively.

Marketable Securities held in Trust Account

As of December 31, 2024, the assets held in the Trust Account, amounting to $235,193,585, were held in a money market mutual fund.

Offering Costs

allocation of proceeds from the issuance of convertible debt into its equity and debt components. The Company applies this guidance to allocate Initial Public Offering proceeds from the Units between Class A ordinary shares and warrants, using the residual method by allocating Initial Public Offering proceeds first to assigned value of the warrants and then to the Class A ordinary shares. Offering costs allocated to the Class A ordinary shares were charged to temporary equity and offering costs allocated to the Public and Private Placement Warrants were charged to shareholders’ equity as Public and Private Placement Warrants after management’s evaluation were accounted for under equity treatment.

Offering Costs

The Company complies with the requirements of the ASC 340-10-S99 and SEC Staff Accounting Bulletin Topic 5A, “Expenses of Offering.” Deferred offering costs consist principally of professional and registration fees that are related to the Initial Public Offering. FASB ASC 470-20, “Debt with Conversion and Other Options,” addresses the allocation of proceeds from the issuance of convertible debt into its equity and debt components. The Company applies this guidance to allocate Initial Public Offering proceeds from the Units between Class A ordinary shares and warrants, using the residual method by allocating Initial Public Offering proceeds first to assigned value of the warrants and then to the Class A ordinary shares. Offering costs allocated to the Class A ordinary shares were charged to temporary equity and offering costs allocated to the Public and Private Placement Warrants were charged to shareholders’ equity as Public and Private Placement Warrants after management’s evaluation were accounted for under equity treatment.

Fair Value of Financial Instruments

The fair value of the Company’s assets and liabilities, which qualify as financial instruments under FASB ASC 820, “Fair Value Measurements and Disclosures,” approximates the carrying amounts represented in the condensed consolidated balance sheets, primarily due to their short-term nature.

Fair Value of Financial Instruments

The fair value of the Company’s assets and liabilities, which qualify as financial instruments under FASB ASC 820, “Fair Value Measurements and Disclosures,” approximates the carrying amounts represented in the balance sheet, primarily due to their short-term nature.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist of a cash account in a financial institution, which, at times, may exceed the Federal Deposit Insurance Corporation coverage limit of $250,000. Any loss incurred or a lack of access to such funds could have a significant adverse impact on the Company’s financial condition, results of operations, and cash flows.

Concentration of Credit Risk

Income Taxes

The Company accounts for income taxes under ASC Topic 740, “Income Taxes,” which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the unaudited condensed consolidated financial statements and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the unaudited condensed consolidated financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more likely than not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. As of June 30, 2025 and December 31, 2024, there were no unrecognized tax benefits and no amounts accrued for interest and penalties. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position.

The Company is considered to be an exempted Cayman Islands company with no connection to any other taxable jurisdiction and is presently not subject to income taxes or income tax filing requirements in the Cayman Islands or the United States. As such, the Company’s tax provision was zero for the period presented.

Income Taxes

The Company accounts for income taxes under ASC Topic 740, “Income Taxes,” which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the financial statement and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more likely than not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. As of December 31, 2024, there were no unrecognized tax benefits and no amounts accrued for interest and penalties. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position.

Net Income (Loss) per Ordinary Share

The Company complies with accounting and disclosure requirements of FASB ASC Topic 260, “Earnings Per Share.” Net income (loss) per ordinary share is computed by dividing net income (loss) by the weighted average number of shares of ordinary shares outstanding for the period. The Company has two classes of ordinary shares, which are referred to as Class A ordinary Shares and Class B ordinary shares. Accretion associated with the redeemable shares of Class A Ordinary Shares is excluded from income per ordinary share as the redemption value approximates fair value.

The following tables reflect the calculation of basic and diluted net income (loss) per ordinary share (in dollars, except per share amounts):

	For the Three Months Ended June 30, 2025				For the Six Months Ended June 30, 2025				For the Period from April 4, 2024 (Inception) Through June 30, 2024
	Class A		Class B		Class A		Class B		Class A		Class B
Basic and diluted net income (loss) per ordinary share
Numerator:
Allocation of net income (loss)	$	480,822	$	120,205	$	1,032,821	$	258,205	$	—	$	(52,663	)
Denominator:
Basic weighted average shares outstanding		23,000,000		5,750,000		23,000,000		5,750,000		—		5,000,000
Basic and diluted net income (loss) per ordinary share	$	0.02	$	0.02	$	0.04	$	0.04	$	—	$	(0.02	)

Net Income per Ordinary Share

The Company complies with accounting and disclosure requirements of FASB ASC Topic 260, “Earnings Per Share.” Net income per ordinary share is computed by dividing net income by the weighted average number of shares of ordinary shares outstanding for the period. The Company has two classes of ordinary shares, which are referred to as redeemable Class A Ordinary Shares and non-redeemable Class B ordinary shares. Accretion associated with the redeemable shares of Class A Ordinary Shares is excluded from income per ordinary share as the redemption value approximates fair value.

The following tables reflect the calculation of basic and diluted net income per ordinary share (in dollars, except per share amounts):

	For the Period from April 4, 2024 (Inception) Through December 31, 2024
	Class A		Class B
Basic and diluted net income per ordinary share
Numerator:
Allocation of net income	$	2,325,597	$	1,083,191
Denominator:
Basic weighted average shares outstanding		11,372,694		5,297,048
Basic net income per ordinary share	$	0.20	$	0.20

Warrant Instruments

The Company accounted for the 11,500,000 Public and 6,850,000 Private Placement Warrants issued in connection with the Initial Public Offering and the private placement in accordance with the guidance contained in FASB ASC Topic 815, “Derivatives and Hedging”. Accordingly, the Company evaluated and classified the warrant instruments under equity treatment at their assigned values. Such guidance provides that the warrants described above were not precluded from equity classification. Equity-classified contracts are initially measured at fair value (or allocated value). Subsequent changes in fair value are not recognized as long as the contracts continue to be classified in equity in accordance with ASC 480 and ASC 815.

Warrant Instruments

Forward Purchase Agreement Liability

On March 26, 2025, the Company entered into a Forward Purchase Agreement. The Company accounts for the Forward Purchase Agreement as a derivative instrument in accordance with the guidance in ASC 815-40. The instrument is subject to re-measurement at each balance sheet date, with changes in fair value recognized in the condensed consolidated statement of operations. The ability of the Company to receive any of the proceeds of the Forward Purchase Agreement is dependent upon the financial metrics of the business combination target, among other factors, rendering the receipt of such proceeds outside the control of the Company. As of June 30, 2025 and December 31, 2024, the fair value of the forward purchase derivative liability was $1,057,124 and $0, respectively.

Class A Redeemable Share Classification

The public shares contain a redemption feature which allows for the redemption of such public shares in connection with the Company’s liquidation, or if there is a shareholder vote or tender offer in connection with the Company’s initial Business Combination. In accordance with ASC 480-10-S99, the Company classifies public shares subject to redemption outside of permanent equity as the redemption provisions are not solely within the control of the Company. The Company recognizes changes in redemption value immediately as they occur and will adjust the carrying value of redeemable shares to equal the redemption value at the end of each reporting period. Immediately upon the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount value. The change in the carrying value of redeemable shares will result in charges against additional paid-in capital (to the extent available) and accumulated deficit. Accordingly, as of June 30, 2025 and December 31, 2024, Class A ordinary shares subject to possible redemption are presented at redemption value as temporary equity, outside of the shareholders’ deficit section of the Company’s condensed consolidated balance sheets.

As of June 30, 2025 and December 31, 2024, the Class A ordinary shares subject to redemption reflected in the condensed consolidated balance sheets are reconciled in the following table:

Gross proceeds	$	230,000,000
Less:
Proceeds allocated to Public Warrants		(529,000	)
Class A ordinary shares issuance costs		(15,341,097	)
Plus:
Accretion of carrying value to redemption value		21,063,682
Class A ordinary shares subject to possible redemption, December 31, 2024		235,193,585
Plus:
Accretion of carrying value to redemption value		2,462,864
Class A ordinary shares subject to possible redemption, March 31, 2025		237,656,449
Plus:
Accretion of carrying value to redemption value		2,477,726
Class A ordinary shares subject to possible redemption, June 30, 2025	$	240,134,175

Class A Redeemable Share Classification

The public shares contain a redemption feature which allows for the redemption of such public shares in connection with the Company’s liquidation, or if there is a shareholder vote or tender offer in connection with the Company’s initial Business Combination. In accordance with ASC 480-10-S99, the Company classifies public shares subject to redemption outside of permanent equity as the redemption provisions are not solely within the control of the Company. The Company recognizes changes in redemption value immediately as they occur and will adjust the carrying value of redeemable shares to equal the redemption value at the end of each reporting period. Immediately upon the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount value. The change in the carrying value of redeemable shares will result in charges against additional paid-in capital (to the extent available) and accumulated deficit. Accordingly, as of December 31, 2024, Class A ordinary shares subject to possible redemption are presented at redemption value as temporary equity, outside of the shareholders’ deficit section of the Company’s balance sheet. As of December 31, 2024, the Class A ordinary shares subject to redemption reflected in the balance sheet are reconciled in the following table:

Gross proceeds	$	230,000,000
Less:
Proceeds allocated to Public Warrants		(529,000	)
Class A ordinary shares issuance costs		(15,341,097	)
Plus:
Accretion of carrying value to redemption value		21,063,682
Class A ordinary shares subject to possible redemption, December 31, 2024	$	235,193,585

Recent Accounting Pronouncements

In November 2024, the FASB issued Accounting Standards Update (“ASU”) 2024-03, “Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses”, requiring public entities to disclose additional information about specific expense categories in the notes to the financial statements on an interim and annual basis. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact of adopting ASU 2024-03.

Management does not believe that any recently other issued, but not effective, accounting standards, if currently adopted, would have a material effect on the Company’s unaudited condensed consolidated financial statements.

Recent Accounting Pronouncements

In November 2023, the FASB issued ASU 2023-07, “Segment Reporting” (Topic 280): Improvements to Reportable Segment Disclosures. The amendments in this ASU require disclosures, on an annual and interim basis, of significant segment expenses that are regularly provided to the chief operating officer decision maker (“CODM”), as well as the aggregate amount of other segment items included in the reported measure of segment profit or loss. The ASU requires that a public entity disclose the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. Public entities will be required to provide all annual disclosures currently required by Topic 280 in interim periods, and entities with a single reportable segment are required to provide all the disclosures required by the amendments in this ASU and existing segment disclosures in Topic 280. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted.

Management does not believe that any recently other issued, but not effective, accounting standards, if currently adopted, would have a material effect on the Company’s financial statement.

Document And Entity Information	6 Months Ended
Document And Entity Information	Jun. 30, 2025
Document Information Line Items
Entity Central Index Key	0002019804
Amendment Description	Amendment No. 4
Document Type	S-4/A
Entity Registrant Name	HCM II Acquisition Corp.
Entity Incorporation, State or Country Code	E9
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Amendment Flag	true

Condensed Consolidated Statements of Changes in Shareholders’ Deficit (Unaudited) (Parentheticals)	9 Months Ended
	Dec. 31, 2024 USD ($)
Statement of Stockholders' Equity [Abstract]
Private Placement Warrants	$ 6,850,000

Significant Accounting Policies

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Significant Accounting Policies [Abstract]

SIGNIFICANT ACCOUNTING POLICIES

NOTE 2. SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Principles of Consolidation

Emerging Growth Company

Use of Estimates

Cash and Cash Equivalents

Marketable Securities Held in Trust Account

As of June 30, 2025 and December 31, 2024, the assets held in the Trust Account, amounting to $240,134,175 and $235,193,585, were held in a Money Market Mutual Fund, respectively.

Offering Costs

Fair Value of Financial Instruments

Concentration of Credit Risk

Income Taxes

Net Income (Loss) per Ordinary Share

The following tables reflect the calculation of basic and diluted net income (loss) per ordinary share (in dollars, except per share amounts):

	For the Three Months Ended June 30, 2025				For the Six Months Ended June 30, 2025				For the Period from April 4, 2024 (Inception) Through June 30, 2024
	Class A		Class B		Class A		Class B		Class A		Class B
Basic and diluted net income (loss) per ordinary share
Numerator:
Allocation of net income (loss)	$	480,822	$	120,205	$	1,032,821	$	258,205	$	—	$	(52,663	)
Denominator:
Basic weighted average shares outstanding		23,000,000		5,750,000		23,000,000		5,750,000		—		5,000,000
Basic and diluted net income (loss) per ordinary share	$	0.02	$	0.02	$	0.04	$	0.04	$	—	$	(0.02	)

Warrant Instruments

Forward Purchase Agreement Liability

Class A Redeemable Share Classification

As of June 30, 2025 and December 31, 2024, the Class A ordinary shares subject to redemption reflected in the condensed consolidated balance sheets are reconciled in the following table:

Gross proceeds	$	230,000,000
Less:
Proceeds allocated to Public Warrants		(529,000	)
Class A ordinary shares issuance costs		(15,341,097	)
Plus:
Accretion of carrying value to redemption value		21,063,682
Class A ordinary shares subject to possible redemption, December 31, 2024		235,193,585
Plus:
Accretion of carrying value to redemption value		2,462,864
Class A ordinary shares subject to possible redemption, March 31, 2025		237,656,449
Plus:
Accretion of carrying value to redemption value		2,477,726
Class A ordinary shares subject to possible redemption, June 30, 2025	$	240,134,175

Recent Accounting Pronouncements

NOTE 3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Emerging Growth Company

Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company which is neither an emerging growth company nor an emerging growth company which has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.

Use of Estimates

Cash and Cash Equivalents

The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had $668,089 in cash as of December 31, 2024.

Marketable Securities held in Trust Account

As of December 31, 2024, the assets held in the Trust Account, amounting to $235,193,585, were held in a money market mutual fund.

Offering Costs

Fair Value of Financial Instruments

The fair value of the Company’s assets and liabilities, which qualify as financial instruments under FASB ASC 820, “Fair Value Measurements and Disclosures,” approximates the carrying amounts represented in the balance sheet, primarily due to their short-term nature.

Concentration of Credit Risk

Income Taxes

The Company accounts for income taxes under ASC Topic 740, “Income Taxes,” which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the financial statement and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more likely than not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. As of December 31, 2024, there were no unrecognized tax benefits and no amounts accrued for interest and penalties. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position.

Net Income per Ordinary Share

The following tables reflect the calculation of basic and diluted net income per ordinary share (in dollars, except per share amounts):

	For the Period from April 4, 2024 (Inception) Through December 31, 2024
	Class A		Class B
Basic and diluted net income per ordinary share
Numerator:
Allocation of net income	$	2,325,597	$	1,083,191
Denominator:
Basic weighted average shares outstanding		11,372,694		5,297,048
Basic net income per ordinary share	$	0.20	$	0.20

Warrant Instruments

Class A Redeemable Share Classification

The public shares contain a redemption feature which allows for the redemption of such public shares in connection with the Company’s liquidation, or if there is a shareholder vote or tender offer in connection with the Company’s initial Business Combination. In accordance with ASC 480-10-S99, the Company classifies public shares subject to redemption outside of permanent equity as the redemption provisions are not solely within the control of the Company. The Company recognizes changes in redemption value immediately as they occur and will adjust the carrying value of redeemable shares to equal the redemption value at the end of each reporting period. Immediately upon the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount value. The change in the carrying value of redeemable shares will result in charges against additional paid-in capital (to the extent available) and accumulated deficit. Accordingly, as of December 31, 2024, Class A ordinary shares subject to possible redemption are presented at redemption value as temporary equity, outside of the shareholders’ deficit section of the Company’s balance sheet. As of December 31, 2024, the Class A ordinary shares subject to redemption reflected in the balance sheet are reconciled in the following table:

Gross proceeds	$	230,000,000
Less:
Proceeds allocated to Public Warrants		(529,000	)
Class A ordinary shares issuance costs		(15,341,097	)
Plus:
Accretion of carrying value to redemption value		21,063,682
Class A ordinary shares subject to possible redemption, December 31, 2024	$	235,193,585

Recent Accounting Pronouncements

Management does not believe that any recently other issued, but not effective, accounting standards, if currently adopted, would have a material effect on the Company’s financial statement.

Condensed Consolidated Balance Sheets (Parentheticals) - $ / shares	Jun. 30, 2025	Dec. 31, 2024
Preference shares, par value (in Dollars per share)	$ 0.0001	$ 0.0001
Preference shares, shares authorized	1,000,000	1,000,000
Preference shares, shares issued
Preference shares, shares outstanding
Class A Ordinary Shares Subject to Possible Redemption
Ordinary shares subject to possible redemption, shares	23,000,000	23,000,000
Ordinary shares subject to possible redemption, per share (in Dollars per share)	$ 10.44	$ 10.23
Class A Ordinary Shares
Ordinary shares, par value (in Dollars per share)	$ 0.0001	$ 0.0001
Ordinary shares, shares authorized	200,000,000	200,000,000
Ordinary shares, shares issued
Ordinary shares, shares outstanding
Class B Ordinary Shares
Ordinary shares, par value (in Dollars per share)	$ 0.0001	$ 0.0001
Ordinary shares, shares authorized	20,000,000	20,000,000
Ordinary shares, shares issued	5,750,000	5,750,000
Ordinary shares, shares outstanding	5,750,000	5,750,000

Fair Value Measurements - Schedule of Company’s Assets that are Measured at Fair Value (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Assets
Money market mutual fund held in Trust Account	$ 240,134,175	$ 235,193,585
Liabilities:
Total forward purchase agreement liability	1,057,124
Level 1 [Member]
Assets
Money market mutual fund held in Trust Account	240,134,175	235,193,585
Liabilities:
Total forward purchase agreement liability
Level 2 [Member]
Assets
Money market mutual fund held in Trust Account
Liabilities:
Total forward purchase agreement liability
Level 3 [Member]
Assets
Money market mutual fund held in Trust Account
Liabilities:
Total forward purchase agreement liability	$ 1,057,124

1605(c) De-SPAC and Related Financing Transactions, Effects	Sep. 23, 2025
Terrestrial and its Affiliates [Member]
Effects of the de-SPAC and Related Financing Transactions [Line Items]
Effects of the de-SPAC and Related Financing Transactions, Detriments [Text Block]	The following describe the potential benefits and detriments to certain groups of stakeholders in connection with the Business Combination: • HCM II: The HCM II Board determined that the Business Combination presents an attractive business opportunity in light of certain factors, including Terrestrial Energy’s future business and financial condition and prospects, strong management team, and in light of the other opportunities for business combinations reasonably available to HCM II. The HCM II Board also considered the potential detriments of the Business Combination to HCM II, including the reliance on projections, the uncertainty of the potential benefits of the Business Combination being achieved, macroeconomics risks, the absence of possible structural protections for minority shareholders, and the risks and costs to HCM II if the Business Combination is not achieved, including the risk that it may result in HCM II being unable to complete a business combination and force HCM II to redeem the Public Shares for a pro rata portion of the funds held in the Trust Account, subject to its obligations under Cayman Islands law to provide for claims of creditors and the requirement of other applicable law, and the HCM II Warrants to expire worthless. For more information, see “— The HCM II Board’s Reasons for the Approval of the Business Combination”, and various risks described under the section entitled “Risk Factors”. • Sponsor: The Sponsor expects to receive substantial consideration in the Business Combination, including (i) 5,675,000 shares of New Terrestrial Common Shares upon conversion of 5,675,000 HCM II Class A Ordinary Shares, consisting of 5,675,000 HCM II Class A Ordinary Shares resulting from the Sponsor Share Conversion and (ii) 4,275,000 New Terrestrial Warrants upon the conversion of 4,275,000 Private Placement Warrants. As a result of the low price paid by the Sponsor for its equity in HCM II, the Sponsor is likely to be able to make a substantial profit on its investment even at a time when Public Shareholders have lost significant value. For more information, see “— Compensation Received by the Sponsor, its Affiliates and HCM II Directors and Executive Officers”. The Sponsor will only be able to realize a return on their equity in HCM II (which may be materially higher than the return realized by Public Shareholders and holders of Public Warrants) if HCM II completes a business combination by August 21, 2026 (or if such date is extended at a duly called meeting of the HCM II shareholders, such later date). Additionally, the Sponsor faces potential detriments from the Business Combination, including the possibility of litigation challenging the Business Combination or the Sponsor’s role in the Business Combination, and the risk that if the Business Combination is not achieved, HCM II may be unable to consummate a business combination and be forced to redeem the Public Shares for a pro rata portion of the funds held in the Trust Account, resulting in the Sponsor and its affiliates’ investment being worthless. • Shawn Matthews: Shawn Matthews, HCM II’s Chairman and Chief Executive Officer, maintains sole control over the voting and disposition of the Founder Shares and the Private Placement Warrants held by the Sponsor and has an economic interest in (i) 2,950,000, or approximately 51.3%, of the Founder Shares held by the Sponsor and (ii) 775,000, or approximately 18.1%, of the Private Placement Warrants held by the Sponsor. The remaining economic interest in the Founder Shares and the Private Placement Warrants held by the Sponsor is indirectly held by seventeen non-managing sponsor investors. Further, Mr. Matthews has received or is entitled to receive (i) $4,000,000 aggregate principal amount of Terrestrial Convertible Notes (plus accrued payment-in-kind interest) and 40,000 Terrestrial Warrants. In the event that the Business Combination is not achieved, (i) HCM II may be unable to consummate a business combination and be forced to redeem the Public Shares for a pro rata portion of the funds held in the Trust Account, resulting in the Sponsor and its affiliates’ investment being worthless, (ii) the value of the $4,000,000 aggregate principal amount of Terrestrial Convertible Notes (plus accrued payment-in-kind interest) and 40,0000 Terrestrial Warrants received by Mr. Matthews may be significantly reduced. In addition, Mr. Matthews and the other HCM II directors face potential detriments from the Business Combination, including the possibility of litigation challenging the Business Combination or such directors’ roles in the Business Combination. • Messrs. Andrew Brenner, Michael Connor, and Jacob Loveless, the independent directors of HCM II. Messrs. Andrew Brenner, Michael Connor, and Jacob Loveless, the independent directors of HCM II, each have an economic interest 25,000 Founders Shares. In the event that the Business Combination is not achieved, HCM II may be unable to consummate a business combination and be forced to redeem the Public Shares for a pro rata portion of the funds held in the Trust Account, resulting in the HCM II independent directors’ investment being worthless. • Unaffiliated HCM II Public Shareholders: The unaffiliated Public Shareholders have the opportunity to evaluate and consider whether or not to redeem their Public Shares in connection with the consummation of the Business Combination. Non-redeeming Public Shareholders will have the opportunity to participate in the potential future growth of Terrestrial Energy, but may face a number of potential detriments in connection with their continued investment, including the uncertainties and risks identified by the HCM II Board described more fully in “— The HCM II Board’s Reasons for the Approval of the Business Combination”, the various other risks associated with the Business Combination, the business of HCM II and the business of Terrestrial Energy, as described further under the section entitled “Risk Factors”, the potential conflicts of interest described under “— Interests of Certain HCM II Persons in the Business Combination”, and the potential material dilution they may experience as described more fully in the section entitled “Dilution”. Redeeming Public Shareholders have the opportunity to receive their pro rata share of the aggregate amount on deposit in the Trust Account, less taxes paid and payable, calculated as of two (2) Business Days prior to the consummation of the Business Combination. However, redeeming Public Shareholders face the potential of not realizing any future growth in value of Terrestrial Energy following the Business Combination. • Terrestrial Energy and its Affiliates: The Terrestrial Board determined that the Business Combination presents an attractive business opportunity in light of certain factors, including, among other factors, that the Business Combination will expand the access to capital for Terrestrial, and taking into account Terrestrial Energy’s expected cash resources and need for additional capital to fund the development of its products and services, and the uniqueness of this particular potential Business Combination, as the negotiated transaction will result in the infusion of capital at the time of Closing. For Terrestrial Energy’s affiliates, the tradability of their New Terrestrial Energy Common Shares is expected to make their holdings more liquid. The Terrestrial Board also considered the potential detriments of the Business Combination to Terrestrial Energy and its affiliates, including, among other factors, the possibility that the Business Combination might not be completed in a timely manner or at all, the uncertainty of the potential benefits of the Business Combination being achieved, the costs involved in connection with completing the Business Combination, and the time and effort of Terrestrial Energy management required to complete the Business Combination. For more information, see “— The Terrestrial Board’s Reasons for the Approval of the Business Combination” and various risks described under the section entitled “Risk Factors.”
Effects of the de-SPAC and Related Financing Transactions, Benefits [Text Block]	The Terrestrial Board determined that the Business Combination presents an attractive business opportunity in light of certain factors, including, among other factors, that the Business Combination will expand the access to capital for Terrestrial, and taking into account Terrestrial Energy’s expected cash resources and need for additional capital to fund the development of its products and services, and the uniqueness of this particular potential Business Combination, as the negotiated transaction will result in the infusion of capital at the time of Closing. For Terrestrial Energy’s affiliates, the tradability of their New Terrestrial Energy Common Shares is expected to make their holdings more liquid.
HCM II [Member]
Effects of the de-SPAC and Related Financing Transactions [Line Items]
Effects of the de-SPAC and Related Financing Transactions, Detriments [Text Block]	possible structural protections for minority shareholders, and the risks and costs to HCM II if the Business Combination is not achieved, including the risk that it may result in HCM II being unable to complete a business combination and force HCM II to redeem the Public Shares for a pro rata portion of the funds held in the Trust Account, subject to its obligations under Cayman Islands law to provide for claims of creditors and the requirement of other applicable law, and the HCM II Warrants to expire worthless. For more information, see “— The HCM II Board’s Reasons for the Approval of the Business Combination”, and various risks described under the section entitled “Risk Factors”.
Effects of the de-SPAC and Related Financing Transactions, Benefits [Text Block]	The HCM II Board determined that the Business Combination presents an attractive business opportunity in light of certain factors, including Terrestrial Energy’s future business and financial condition and prospects, strong management team, and in light of the other opportunities for business
Sponsor [Member]
Effects of the de-SPAC and Related Financing Transactions [Line Items]
Effects of the de-SPAC and Related Financing Transactions, Detriments [Text Block]	Additionally, the Sponsor faces potential detriments from the Business Combination, including the possibility of litigation challenging the Business Combination or the Sponsor’s role in the Business Combination, and the risk that if the Business Combination is not achieved, HCM II may be unable to consummate a business combination and be forced to redeem the Public Shares for a pro rata portion of the funds held in the Trust Account, resulting in the Sponsor and its affiliates’ investment being worthless.
Effects of the de-SPAC and Related Financing Transactions, Benefits [Text Block]	The Sponsor expects to receive substantial consideration in the Business Combination, including (i) 5,675,000 shares of New Terrestrial Common Shares upon conversion of 5,675,000 HCM II Class A Ordinary Shares, consisting of 5,675,000 HCM II Class A Ordinary Shares resulting from the Sponsor Share Conversion and (ii) 4,275,000 New Terrestrial Warrants upon the conversion of 4,275,000 Private Placement Warrants. As a result of the low price paid by the Sponsor for its equity in HCM II, the Sponsor is likely to be able to make a substantial profit on its investment even at a time when Public Shareholders have lost significant value. For more information, see “— Compensation Received by the Sponsor, its Affiliates and HCM II Directors and Executive Officers”. The Sponsor will only be able to realize a return on their equity in HCM II (which may be materially higher than the return realized by Public Shareholders and holders of Public Warrants) if HCM II completes a business combination by August 21, 2026 (or if such date is extended at a duly called meeting of the HCM II shareholders, such later date).
Shawn Matthews [Member]
Effects of the de-SPAC and Related Financing Transactions [Line Items]
Effects of the de-SPAC and Related Financing Transactions, Detriments [Text Block]	In addition, Mr. Matthews and the other HCM II directors face potential detriments from the Business Combination, including the possibility of litigation challenging the Business Combination or such directors’ roles in the Business Combination.
Effects of the de-SPAC and Related Financing Transactions, Benefits [Text Block]	Shawn Matthews, HCM II’s Chairman and Chief Executive Officer, maintains sole control over the voting and disposition of the Founder Shares and the Private Placement Warrants held by the Sponsor and has an economic interest in (i) 2,950,000, or approximately 51.3%, of the Founder Shares held by the Sponsor and (ii) 775,000, or approximately 18.1%, of the Private Placement Warrants held by the Sponsor. The remaining economic interest in the Founder Shares and the Private Placement Warrants held by the Sponsor is indirectly held by seventeen non-managing sponsor investors. Further, Mr. Matthews has received or is entitled to receive (i) $4,000,000 aggregate principal amount of Terrestrial Convertible Notes (plus accrued payment-in-kind interest) and 40,000 Terrestrial Warrants. In the event that the Business Combination is not achieved, (i) HCM II may be unable to consummate a business combination and be forced to redeem the Public Shares for a pro rata portion of the funds held in the Trust Account, resulting in the Sponsor and its affiliates’ investment being worthless, (ii) the value of the $4,000,000 aggregate principal amount of Terrestrial Convertible Notes (plus accrued payment-in-kind interest) and 40,0000 Terrestrial Warrants received by Mr. Matthews may be significantly reduced.
Messrs [Member]
Effects of the de-SPAC and Related Financing Transactions [Line Items]
Effects of the de-SPAC and Related Financing Transactions, Benefits [Text Block]	Messrs. Andrew Brenner, Michael Connor, and Jacob Loveless, the independent directors of HCM II. Messrs. Andrew Brenner, Michael Connor, and Jacob Loveless, the independent directors of HCM II, each have an economic interest 25,000 Founders Shares. In the event that the Business Combination is not achieved, HCM II may be unable to consummate a business combination and be forced to redeem the Public Shares for a pro rata portion of the funds held in the Trust Account, resulting in the HCM II independent directors’ investment being worthless.
Unaffiliated HCM II Public Shareholders [Member]
Effects of the de-SPAC and Related Financing Transactions [Line Items]
Effects of the de-SPAC and Related Financing Transactions, Detriments [Text Block]	Non-redeeming Public Shareholders will have the opportunity to participate in the potential future growth of Terrestrial Energy, but may face a number of potential detriments in connection with their continued investment, including the uncertainties and risks identified by the HCM II Board described more fully in “— The HCM II Board’s Reasons for the Approval of the Business Combination”, the various other risks associated with the Business Combination, the business of HCM II and the business of Terrestrial Energy, as described further under the section entitled “Risk Factors”, the potential conflicts of interest described under “— Interests of Certain HCM II Persons in the Business Combination”, and the potential material dilution they may experience as described more fully in the section entitled “Dilution”. Redeeming Public Shareholders have the opportunity to receive their pro rata share of the aggregate amount on deposit in the Trust Account, less taxes paid and payable, calculated as of two (2) Business Days prior to the consummation of the Business Combination. However, redeeming Public Shareholders face the potential of not realizing any future growth in value of Terrestrial Energy following the Business Combination.
Effects of the de-SPAC and Related Financing Transactions, Benefits [Text Block]	The unaffiliated Public Shareholders have the opportunity to evaluate and consider whether or not to redeem their Public Shares in connection with the consummation of the Business Combination.

Summary of Significant Accounting Policies - Schedule of Class A Ordinary Shares Subject to Redemption (Details) - Class A Ordinary Shares Subject to Redemption [Member] - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2024
Schedule of Class A Ordinary Shares Subject to Redemption [Line Items]
Gross proceeds			$ 230,000,000	$ 230,000,000
Less:
Proceeds allocated to Public Warrants			(529,000)	(529,000)
Class A ordinary shares issuance costs			(15,341,097)	(15,341,097)
Plus:
Accretion of carrying value to redemption value	$ 2,477,726	$ 2,462,864	21,063,682	21,063,682
Class A ordinary shares subject to possible redemption, December 31, 2024	$ 240,134,175	$ 237,656,449	$ 235,193,585	$ 235,193,585

- Definition

+ References

+ Details

Related Party Transactions (As Restated)

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

NOTE 5. RELATED PARTY TRANSACTIONS (AS RESTATED)

Founder Shares

On April 8, 2024, the Sponsor made a capital contribution of $25,000, or approximately $0.004 per share, to cover certain of the Company’s expenses, for which the Company issued 5,750,000 founders shares to the Sponsor. Up to 750,000 of the founder shares may be surrendered by the Sponsor for no consideration depending on the extent to which the underwriter’s over-allotment is exercised. On August 19, 2024, the underwriter exercised its over-allotment option in full as part of the closing of the Initial Public Offering. As such, the 750,000 founder shares are no longer subject to forfeiture.

The Company’s initial shareholders have agreed not to transfer, assign or sell any of their founder shares and any Class A ordinary shares issued upon conversion thereof until the earlier to occur of (i) one year after the completion of the initial Business Combination or (ii) the date on which the Company completes a liquidation, merger, share exchange or other similar transaction after the initial Business Combination that results in all of the Company’s shareholders having the right to exchange their Class A ordinary shares for cash, securities or other property. Any permitted transferees will be subject to the same restrictions and other agreements of the Company’s initial shareholders with respect to any founder shares (the “Lock-up”). Notwithstanding the foregoing, if (1) the closing price of the Class A ordinary shares equals or exceeds $12.00 per share (as adjusted for share subdivision, share capitalizations, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination or (2) if the Company consummates a transaction after the initial Business Combination which results in the Company’s shareholders having the right to exchange their shares for cash, securities or other property, the founder shares will be released from the Lock-up.

Promissory Note — Related Party

The Sponsor has agreed to loan the Company an aggregate of up to $300,000 to be used for a portion of the expenses of the Initial Public Offering. The loan is non-interest bearing, unsecured and due at the earlier of December 31, 2024 or the closing of the Initial Public Offering. The Company repaid all the outstanding balance of the note at the closing of the Initial Public Offering on August 19, 2024. Borrowings under the note are no longer available.

Administrative Services Agreement

The Company entered into an agreement, commencing on August 15, 2024, through the earlier of consummation of the initial Business Combination and the liquidation, to pay the Sponsor $15,000 per month for office space, utilities and secretarial and administrative support services. For the three and six months ended June 30, 2025, the Company incurred and paid $45,000 and $90,000 for these services, respectively. For the period from April 4, 2024 (inception) through June 30, 2024, the Company did not incur any fees for these services.

Due from Sponsor

The Company covered certain expenses on behalf of its Sponsor, paying $4,466 as of June 30, 2025 and December 31, 2024, of which such amount is included in due from Sponsor in the accompanying condensed consolidated balance sheets.

Related Party Loans

In order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor or certain of the Company’s officers and directors may, but are not obligated to, loan the Company funds as may be required (the “Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans. In the event that a Business Combination does not close, the Company may use a portion of the working capital held outside the Trust Account to repay the Working Capital Loans but no proceeds from the Trust Account would be used to repay the Working Capital Loans. Up to $1,500,000 of such Working Capital Loans may be convertible into private placement warrants of the post Business Combination entity at a price of $1.00 per warrant at the option of the lender. The warrants would be identical to the Private Placement Warrants. As of June 30, 2025 and December 31, 2024, no such Working Capital Loans were outstanding.

NOTE 6. RELATED PARTY TRANSACTIONS

Founder Shares

On April 8, 2024, the Sponsor made a capital contribution of $25,000, or approximately $0.004 per share, to cover certain of the Company’s expenses, for which the Company issued 5,750,000 founders shares to the Sponsor. Up to 750,000 of the founder shares may be surrendered by the Sponsor for no consideration depending on the extent to which the underwriters’ over-allotment is exercised. On August 19, 2024, the underwriters exercised their over-allotment option in full as part of the closing of the Initial Public Offering. As such, the 750,000 founder shares are no longer subject to forfeiture.

The Company’s initial shareholders have agreed not to transfer, assign or sell any of their founder shares and any Class A ordinary shares issued upon conversion thereof until the earlier to occur of (i) one (1) year after the completion of the initial Business Combination or (ii) the date on which the Company completes a liquidation, merger, share exchange or other similar transaction after the initial Business Combination that results in all of the Company’s shareholders having the right to exchange their Class A ordinary shares for cash, securities or other property. Any permitted transferees will be subject to the same restrictions and other agreements of the Company’s initial shareholders with respect to any founder shares (the “Lock-up”). Notwithstanding the foregoing, if (1) the closing price of the Class A ordinary shares equals or exceeds $12.00 per share (as adjusted for share subdivision, share capitalizations, reorganizations, recapitalizations and the like) for any twenty (20) trading days within any thirty (30)-trading day period commencing at least 150 days after the initial Business Combination or (2) if the Company consummates a transaction after the initial Business Combination which results in the Company’s shareholders having the right to exchange their shares for cash, securities or other property, the founder shares will be released from the Lock-up.

Promissory Note — Related Party

Administrative Services Agreement

The Company entered into an agreement, commencing on August 15, 2024, through the earlier of consummation of the initial Business Combination and the liquidation, to pay the Sponsor $15,000 per month for office space, utilities and secretarial and administrative support services. For the period from April 4, 2024 (inception) through December 31, 2024, the Company incurred $62,500 for these services.

Related Party Loans

In order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor or certain of the Company’s officers and directors may, but are not obligated to, loan the Company funds as may be required (the “Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans. In the event that a Business Combination does not close, the Company may use a portion of the working capital held outside the Trust Account to repay the Working Capital Loans but no proceeds from the Trust Account would be used to repay the Working Capital Loans. Up to $1,500,000 of such Working Capital Loans may be convertible into private placement warrants of the post Business Combination entity at a price of $1.00 per warrant at the option of the lender. The warrants would be identical to the Private Placement Warrants. As of December 31, 2024, no such Working Capital Loans were outstanding.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/1943274/2147480990/946-20-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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-Section 50
-Paragraph 1
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-Publisher FASB
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+ Details

Related Party Transactions (As Restated) (Details) - USD ($)			3 Months Ended	6 Months Ended	9 Months Ended
	Aug. 15, 2024	Apr. 08, 2024	Jun. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Aug. 19, 2024
Related Party Transactions [Line Items]
Price per share (in Dollars per share)			$ 10.05	$ 10.05	$ 10.05
Trading day period				20 days	20 days
Trading period of commencing				30 days	20 days
Business days				150 days	30 days
Incurred amount	$ 15,000		$ 45,000	$ 90,000	$ 62,500
Due from Sponsor			$ 4,466	4,466	4,466
Working capital loans				$ 1,500,000	$ 1,500,000
Business Combination [Member]
Related Party Transactions [Line Items]
Business Combination entity price (in Dollars per share)			$ 1	$ 1	$ 1
Sponsor [Member]
Related Party Transactions [Line Items]
Founder shares issued (in Shares)		25,000
Price per share (in Dollars per share)		$ 0.004
Founder Shares [Member]
Related Party Transactions [Line Items]
Founder shares issued (in Shares)		5,750,000
Forfeiture shares (in Shares)		750,000
Subject to forfeiture shares (in Shares)		750,000
Class A Ordinary Shares [Member]
Related Party Transactions [Line Items]
After completion initial Business Combination				1 year
Price per share (in Dollars per share)			$ 12	$ 12	$ 12
Class A Ordinary Shares [Member] \| Business Combination [Member]
Related Party Transactions [Line Items]
After completion initial Business Combination					1 year
Sponsor [Member]
Related Party Transactions [Line Items]
Founder shares issued (in Shares)		25,000
Price per share (in Dollars per share)		$ 0.004
Initial Public Offering [Member]
Related Party Transactions [Line Items]
Price per share (in Dollars per share)						$ 10
Initial Public Offering [Member] \| Related Party [Member]
Related Party Transactions [Line Items]
Loan expenses			$ 300,000	$ 300,000	$ 300,000
Initial Public Offering [Member] \| Class A Ordinary Shares [Member]
Related Party Transactions [Line Items]
Price per share (in Dollars per share)						$ 10

Initial Public Offering (Details) - $ / shares		6 Months Ended	9 Months Ended
Initial Public Offering (Details) - $ / shares	Aug. 19, 2024	Jun. 30, 2025	Dec. 31, 2024
Initial Public Offering [Line Items]
Exercise price of warrants (in Dollars per share)		$ 11.5	$ 11.5
Completion days	30 days
Warrants outstanding		18,350,000	18,350,000
Minimum threshold written notice period for redemption of public warrants.		30 days	30 days
Threshold trading days for redemption of public warrants		20 days	20 days
Threshold consecutive trading days for redemption of public warrants		30 days	20 days
Redeemable Public Warrant [Member]
Initial Public Offering [Line Items]
Number of issued per unit	1
Public Warrants [Member]
Initial Public Offering [Line Items]
Exercise price of warrants (in Dollars per share)	$ 11.5
Warrants outstanding			11,500,000
Warrant [Member]
Initial Public Offering [Line Items]
Exercise price of warrants (in Dollars per share)		$ 1	$ 1
Stock price trigger for redemption of public warrants (in Dollars per share)		18	18
Warrant price per share (in Dollars per share)		0.01	0.01
Private Placement Warrants [Member]
Initial Public Offering [Line Items]
Price per sale of stock (in Dollars per share)		$ 1	$ 1
Warrants outstanding		6,850,000	6,850,000
Business Combination [Member]
Initial Public Offering [Line Items]
Warrant term		5 years	5 years
Business Combination [Member] \| Warrant [Member]
Initial Public Offering [Line Items]
After completion initial Business Combination		30 days	30 days
Class A Ordinary Shares [Member]
Initial Public Offering [Line Items]
Price per sale of stock (in Dollars per share)		$ 0.0001
Number of issued per unit	1
After completion initial Business Combination		1 year
Stock price trigger for redemption of public warrants (in Dollars per share)		$ 18	$ 18
Class A Ordinary Shares [Member] \| Warrant [Member]
Initial Public Offering [Line Items]
Number of shares of common stock converted from each warrant		1	1
Exercise price of warrants (in Dollars per share)		$ 11.5	$ 11.5
Class A Ordinary Shares [Member] \| Business Combination [Member]
Initial Public Offering [Line Items]
After completion initial Business Combination			1 year
IPO [Member]
Initial Public Offering [Line Items]
Number of founder shares purchased by sponsor	23,000,000
Price per sale of stock (in Dollars per share)	$ 10
IPO [Member] \| Public Warrants [Member]
Initial Public Offering [Line Items]
Number of shares of common stock converted from each warrant	1
IPO [Member] \| Warrant [Member]
Initial Public Offering [Line Items]
Warrant term	5 years
IPO [Member] \| Private Placement Warrants [Member]
Initial Public Offering [Line Items]
Price per sale of stock (in Dollars per share)	$ 10.05
IPO [Member] \| Class A Ordinary Shares [Member]
Initial Public Offering [Line Items]
Number of founder shares purchased by sponsor	23,000,000
Price per sale of stock (in Dollars per share)	$ 10
Over-Allotment Option [Member]
Initial Public Offering [Line Items]
Number of founder shares purchased by sponsor	3,000,000		3,000,000
Over-Allotment Option [Member] \| Class A Ordinary Shares [Member]
Initial Public Offering [Line Items]
Number of founder shares purchased by sponsor	3,000,000

Fair Value Measurements - Schedule of Fair Value of the Forward Purchase Agreement Derivative Liability (Details)	Jun. 30, 2025	Mar. 26, 2025	Aug. 19, 2024
Probability of business combination [Member]
Schedule of Fair Value of the Forward Purchase Agreement Derivative Liability [Line Items]
Fair Value Measurement Input	90	90
Underlying ordinary share price [Member]
Schedule of Fair Value of the Forward Purchase Agreement Derivative Liability [Line Items]
Fair Value Measurement Input	11.1	10.8	9.98
Term (years) [Member]
Schedule of Fair Value of the Forward Purchase Agreement Derivative Liability [Line Items]
Fair Value Measurement Input	0.25	0.42	7
Risk-free rate [Member]
Schedule of Fair Value of the Forward Purchase Agreement Derivative Liability [Line Items]
Fair Value Measurement Input	4.41	4.28	3.78
Volatility [Member]
Schedule of Fair Value of the Forward Purchase Agreement Derivative Liability [Line Items]
Fair Value Measurement Input	28.82	10.73	9

Segment Information (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Segment Information [Abstract]

Schedule of Net Income and Total Assets

When evaluating the Company’s performance and making key decisions regarding resource allocation, the CODM reviews several key metrics included in net income and total assets, which include the following:

	June 30, 2025		December 31, 2024
Marketable Securities held in trust account	$	240,134,175	$	235,193,585
Cash	$	124,083	$	668,089

	For the Three Months Ended June 30, 2025		For the Six Months Ended June 30, 2025		For the Period from April 4, 2024 (Inception) Through June 30, 2025
Net income (loss)	$	601,027	$	1,291,026	$	(52,663	)
General and administrative expenses	$	1,489,307	$	2,592,440	$	52,663
Interest earned on marketable securities held in Trust Account	$	2,477,726	$	4,940,590	$	—

	December 31, 2024
Trust Account	$	235,193,585
Cash	$	668,089

	December 31, 2024
Net income (loss)	$	3,408,788
General and administrative expenses	$	634,797
Interest earned on marketable securities held in Trust Account	$	4,043,585

Segment Information

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Segment Information [Abstract]

SEGMENT INFORMATION

NOTE 9. SEGMENT INFORMATION

ASC Topic 280, “Segment Reporting,” establishes standards for companies to report in their unaudited condensed consolidated financial statement information about operating segments, products, services, geographic areas, and major customers. Operating segments are defined as components of an enterprise that engage in business activities from which it may recognize revenues and incur expenses, and for which separate financial information is available that is regularly evaluated by the Company’s chief operating decision maker (“CODM”), or group, in deciding how to allocate resources and assess performance.

The Company’s CODM has been identified as the Chief Financial Officer, who reviews the assets, operating results, and financial metrics for the Company as a whole to make decisions about allocating resources and assessing financial performance. Accordingly, management has determined that there is only one reportable segment.

The CODM assesses performance for the single segment and decides how to allocate resources based on net income that also is reported on the condensed consolidated statement of operations as net income or loss. The measure of segment assets is reported on the condensed consolidated balance sheets as total assets. When evaluating the Company’s performance and making key decisions regarding resource allocation, the CODM reviews several key metrics included in net income and total assets, which include the following:

	June 30, 2025		December 31, 2024
Marketable Securities held in trust account	$	240,134,175	$	235,193,585
Cash	$	124,083	$	668,089

	For the Three Months Ended June 30, 2025		For the Six Months Ended June 30, 2025		For the Period from April 4, 2024 (Inception) Through June 30, 2025
Net income (loss)	$	601,027	$	1,291,026	$	(52,663	)
General and administrative expenses	$	1,489,307	$	2,592,440	$	52,663
Interest earned on marketable securities held in Trust Account	$	2,477,726	$	4,940,590	$	—

The CODM reviews interest earned on the Trust Account to measure and monitor shareholder value and determine the most effective strategy of investment with the Trust Account funds while maintaining compliance with the Trust Agreement.

Net income and general and administrative expenses are reviewed and monitored by the CODM to manage and forecast cash to ensure enough capital is available to complete a business combination or similar transaction within the business combination period. The CODM also reviews general and administrative costs to manage, maintain and enforce all contractual agreements to ensure costs are aligned with all agreements and budget. General and administrative costs, as reported on the condensed consolidated statement of operations, are the significant segment expenses provided to the CODM on a regular basis. The accounting policies used to measure the profit and loss of the segment are the same as those described in the summary of significant accounting policies.

NOTE 10. SEGMENT INFORMATION

ASC Topic 280, “Segment Reporting,” establishes standards for companies to report in their financial statement information about operating segments, products, services, geographic areas, and major customers. Operating segments are defined as components of an enterprise that engage in business activities from which it may recognize revenues and incur expenses, and for which separate financial information is available that is regularly evaluated by the Company’s chief operating decision maker, or group, in deciding how to allocate resources and assess performance.

The Company’s chief operating decision maker (“CODM”) has been identified as the Chief Financial Officer, who reviews the assets, operating results, and financial metrics for the Company as a whole to make decisions about allocating resources and assessing financial performance. Accordingly, management has determined that there is only one reportable segment

The CODM assesses performance for the single segment and decides how to allocate resources based on net income that also is reported on the statement of operations as net income. The measure of segment assets is reported on the balance sheet as total assets. When evaluating the Company’s performance and making key decisions regarding resource allocation, the CODM reviews several key metrics included in net income and total assets, which include the following:

	December 31, 2024
Trust Account	$	235,193,585
Cash	$	668,089

	December 31, 2024
Net income (loss)	$	3,408,788
General and administrative expenses	$	634,797
Interest earned on marketable securities held in Trust Account	$	4,043,585

Net income (loss) and general and administrative expenses are reviewed and monitored by the CODM to manage and forecast cash to ensure enough capital is available to complete a business combination or similar transaction within the business combination period. The CODM also reviews general and administrative costs to manage, maintain and enforce all contractual agreements to ensure costs are aligned with all agreements and budget. General and administrative costs, as reported on the statement of operations, are the significant segment expenses provided to the CODM on a regular basis. The accounting policies used to measure the profit and loss of the segment are the same as those described in the summary of significant accounting policies.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

S-K 1604, De-SPAC Transaction

Sep. 23, 2025

De-SPAC Transactions, Dilution [Line Items]

De-SPAC Forepart, Board Determination [Text Block]

The board of directors of HCM II Acquisition Corp., a Cayman Islands exempted company (“HCM II”), has unanimously approved and determined to be in the best interests of HCM II and its shareholders (“you”) to enter into the business combination among HCM II, HCM II Merger Sub Inc., a Delaware corporation and a direct wholly owned subsidiary of HCM II (“Merger Sub”), and Terrestrial Energy Inc., a Delaware corporation (referred to herein prior to the Business Combination (as defined below) as “Terrestrial Energy”, and, subsequent to the Business Combination, as “Terrestrial Energy Opco”), pursuant to which, (1) at the closing of the transactions contemplated by the Business Combination Agreement (as defined below) (the “Closing”) and following the Domestication (as defined below), Merger Sub will merge with and into Terrestrial Energy (the “Merger”), with Terrestrial Energy surviving as a wholly-owned subsidiary of HCM II, pursuant to the terms and subject to the conditions set forth in the Business Combination Agreement, dated as of March 26, 2025 (the “Signing Date”), by and among HCM II, Merger Sub and Terrestrial Energy, attached to this proxy statement/prospectus as Annex A (as it may be amended, modified, supplemented or otherwise modified from time to time in accordance with its terms, the “Business Combination Agreement”), resulting in a combined company whereby HCM II will become the sole stockholder of Terrestrial Energy Opco, and substantially all of the assets and the business of the combined company will be held and operated by Terrestrial Energy Opco and its subsidiaries, as more fully described elsewhere in this proxy statement/prospectus; (2) HCM II will domesticate (the “Domestication”) as a Delaware corporation (following the Domestication, “New Terrestrial Energy”) in accordance with the Delaware General Corporation Law (“DGCL”), the Companies Act (as revised) of the Cayman Islands (the “Companies Act”) and the amended and restated memorandum and articles of association of HCM II (as may be amended from time to time, the “Cayman Constitutional Documents”), and (3) the other transactions contemplated by the Business Combination Agreement and documents related thereto will be consummated (such transactions, together with the Merger and the Domestication, the “Business Combination”). Effective immediately following the consummation of the Business Combination, New Terrestrial Energy will be renamed “Terrestrial Energy Inc.”

De-SPAC, Board Determination, Prospectus Summary [Text Block]

The PIPE Investors are permitted, under the PIPE Subscription Agreements, to satisfy their commitments thereunder if they hold shares of New Terrestrial Common Shares that qualify as Non-Redeemed Shares (as defined herein), subject to certain conditions and restrictions set forth in the PIPE Subscription Agreements.

De-SPAC Forepart, Sponsor Compensation, Material Dilution [Flag]

true

De-SPAC, Background, Prospectus Summary [Text Block]

(h) each Terrestrial Common Share and Terrestrial Series A Preferred Share that, immediately prior to the Effective Time, is owned by HCM II or Merger Sub (or any other subsidiary of HCM II), or held by Terrestrial Energy (in treasury or otherwise), if any (each, an “Excluded Share”), will be automatically cancelled and retired without any conversion thereof and will cease to exist, and no consideration will be delivered in exchange therefore;

De-SPAC Forepart, Material Financing Transactions Occurred, Description [Text Block]

Prior to the Closing, Terrestrial Energy and its subsidiaries will take, or cause to be taken, such actions as Terrestrial Energy and its subsidiaries determine (in their sole discretion) to be necessary or advisable to provide the holders of Exchangeable Shares with the ability to continue to hold, following the Closing, Exchangeable Shares (the “ExchangeCo Recapitalization”), with such Exchangeable Shares to be exchangeable for New Terrestrial Common Shares following the Closing in accordance with the terms and conditions of such Exchangeable Shares following the ExchangeCo Recapitalization, including by causing Terrestrial Energy Canada (Exchange) Inc. (“ExchangeCo”) to call a special meeting of its shareholders to vote on a proposal to effectuate the ExchangeCo Recapitalization.

The HCM II Units, HCM II Class A Ordinary Shares and HCM II Warrants are currently listed on the Nasdaq Stock Market LLC (“Nasdaq”) under the symbols “HONDU”, “HOND” and “HONDW”, respectively. Pursuant to the terms of the Business Combination Agreement, as a closing condition (subject to certain exceptions), the New Terrestrial Common Shares issued in connection with the Business Combination is to be approved for listing on Nasdaq, but there can be no assurance that such listing condition will be met. If such listing condition is not met, the Business Combination will not be consummated unless the listing condition is waived by the parties to the Business Combination Agreement. Following the Closing, the New Terrestrial Common Shares and New Terrestrial Warrants are intended to be listed, subject to Nasdaq approval, under the proposed symbols “IMSR” and “IMSRW”, respectively. It is important for you to know that, at the time of our extraordinary general meeting, we may not have received from Nasdaq either confirmation of the listing of the New Terrestrial Common Shares and New Terrestrial Warrants or that approval will be obtained prior to the consummation of the Business Combination, and it is possible that the listing condition to the consummation of the Business Combination may be waived by the parties to the Business Combination Agreement. As a result, you may be asked to vote to approve the Business Combination and the other proposals included in this proxy statement/prospectus without such confirmation, and, further, it is possible that such confirmation may never be received and the Business Combination could still be consummated if such condition is waived or is subject to an exception and therefore the New Terrestrial Energy securities would not be listed on any nationally recognized securities exchange.

De-SPAC Forepart, Report Concerning Approval of Transaction Received [Text Block]

In connection with HCM II’s IPO (as defined in the accompanying proxy statement/prospectus), HCM Investor Holdings II, LLC, (the “Sponsor”), and HCM II’s directors and executive officers entered into letter agreements, pursuant to which they agreed to vote their HCM II Ordinary Shares in favor of the Business Combination Proposal (as defined herein). Further, concurrently with the execution of the Business Combination Agreement, the Sponsor entered into the Sponsor Support Agreement with HCM II and Terrestrial Energy, dated as of March 26, 2025

(the “Sponsor Support Agreement”), pursuant to which the Sponsor agreed to vote its shares in favor of all proposals being presented at the extraordinary general meeting. As of the Record Date (as defined in the accompanying proxy statement/prospectus), the Sponsor owned approximately 20% of the total outstanding HCM II Ordinary Shares.

De-SPAC, Compensation, Prospectus Summary [Table Text Block]

Set forth below is a summary of the amount of compensation and securities received or to be received by the Sponsor, its affiliates and HCM II’s directors, officers and their affiliates in connection with the Business Combination and related transactions.

Entity/Individual	Amount of Compensation Received or to be Received or Securities Issued or to be Issued	Consideration
Sponsor	5,675,000 shares of New Terrestrial Common Shares upon conversion of 5,675,000 HCM II Class A Ordinary Shares.	$24,700
	4,275,000 New Terrestrial Warrants upon the conversion of 4,275,000 Private Placement Warrants. $15,000 per month for office space, utilities and secretarial and administrative support services which may be due from Terrestrial Energy as a reimbursable expense and up to $2,500,000 in a Convertible Promissory Note which may be converted into 1,500,000 Private Placement Warrants. As of the date of this proxy statement/prospectus, an aggregate of approximately $195,000 is owed to the Sponsor in exchange for such office space, utilities and secretarial and administrative support services.	$4,275,000
Shawn Matthews	2,950,000, or approximately 51.3%, of the Founder Shares held by the Sponsor. 775,000, or approximately 18.1%, of the Private Placement Warrants held by the Sponsor.	Mr. Matthews paid an aggregate of $800,000 for his economic interests in Founder Shares and Private Placement Warrants to be converted in connection with the Business Combination into 5,675,000 shares of New Terrestrial Common Shares and 4,275,000 New Terrestrial Warrants assuming an Exchange Ratio of 45.85 and no redemptions.
	An amount of New Terrestrial Common Shares equal to $4,000,000, plus any accrued and unpaid interest on his Terrestrial Convertible Notes, divided by seventy-five percent (75%) of the Redemption Price (such amount of shares of New Terrestrial Common Shares will increase prior to Closing due to additional payment-in-kind interest accrued on the Terrestrial Convertible Notes).	Mr. Matthews paid an aggregate of $4,000,000 for his economic interests in Terrestrial Convertible Notes to be converted into 535,601 shares of New Terrestrial Common Shares assuming a Redemption Price of $10.44 in connection with the Business Combination and the Terrestrial Warrants will be exercisable into approximately 1,834,000 shares of New Terrestrial Common Shares assuming an Exchange Ratio of 45.85 and no redemptions following the Business Combination.

Entity/Individual	Amount of Compensation Received or to be Received or Securities Issued or to be Issued	Consideration
	Approximately 1,834,000 New Terrestrial Common Shares that will become issuable assuming an Exchange Ratio of 45.85 and no redemptions upon the exercise of the warrants to be issued in connection with the conversion of 40,000 Terrestrial Warrants.
	Offered a directorship in New Terrestrial Energy following the Closing. All members of the New Terrestrial Board and all executive officers of New Terrestrial Energy will be eligible for awards under the New Equity Incentive Plan and, thus, have a personal interest in the approval of the New Equity Incentive Plan. Nevertheless, the HCM II Board believes that it is important to provide incentives and rewards for superior performance and the retention of executive officers and experienced directors, among others, by adopting the New Equity Incentive Plan.
Each of Messrs. Andrew Brenner, Michael Connor, and Jacob Loveless	25,000 shares of New Terrestrial Common Shares upon conversion of 25,000 HCM II Class A Ordinary Shares, with respect to each such HCM II independent director.	$100 with respect to each HCM II independent director.
Officers and Directors	Reimbursement for any out-of-pocket expenses related to identifying, investigating, negotiating and completing an initial business combination. There is no cap or ceiling on the reimbursement of out-of-pocket expenses incurred by such persons in connection with activities on our behalf.	Services in connection with identifying, investigating and completing an initial business combination.

Private Placement

6 Months Ended

12 Months Ended

Jun. 30, 2025

Dec. 31, 2024

Class of Stock Disclosures [Abstract]

PRIVATE PLACEMENT

NOTE 4. PRIVATE PLACEMENT

Simultaneously with the closing of the Initial Public Offering, the Sponsor and Cantor Fitzgerald & Co. purchased an aggregate of 6,850,000 warrants, each exercisable to purchase one Class A ordinary share at $11.50 per share, at a price of $1.00 per warrant, or $6,850,000 in the aggregate, in a private placement. Of those 6,850,000 Private Placement Warrants, the Sponsor purchased 4,275,000 Private Placement Warrants and Cantor Fitzgerald & Co. purchased 2,575,000 Private Placement Warrants. Each whole warrant entitles the registered holder to purchase one Class A ordinary share at a price of $11.50 per share, subject to adjustment.

The Private Placement Warrants were identical to the Public Warrants sold in the Initial Public Offering except that, so long as they are held by the Sponsor, Cantor Fitzgerald & Co. or their permitted transferees, the Private Placement Warrants (i) may not (including the Class A ordinary shares issuable upon exercise of these Private Placement Warrants), subject to certain limited exceptions, be transferred, assigned or sold by the holders until 30 days after the completion of the initial Business Combination, (ii) will be entitled to registration rights and (iii) with respect to private placement warrants held by Cantor Fitzgerald & Co. and/or its designees, will not be exercisable more than five years from the commencement of sales in this offering in accordance with Financial Industry Regulatory Authority Rule 5110(g)(8).

complete the initial Business Combination within the Completion Window and to liquidating distributions from assets outside the Trust Account; and (iv) vote any founder shares held by them and any public shares purchased during or after the Initial Public Offering (including in open market and privately negotiated transactions, aside from shares they may purchase in compliance with the requirements of Rule 14e-5 under the Exchange Act, which would not be voted in favor of approving the Business Combination) in favor of the initial Business Combination.

NOTE 5. PRIVATE PLACEMENT

The Sponsor, officers and directors have entered into a letter agreement with the Company, pursuant to which they have agreed to (i) waive their redemption rights with respect to their founder shares and public shares in connection with the completion of the initial Business Combination; (ii) waive their redemption rights with respect to their founder shares and public shares in connection with a shareholder vote to approve an amendment to the Company’s amended and restated memorandum and articles of association (A) to modify the substance or timing of the Company’s obligation to allow redemption in connection with the initial Business Combination or to redeem 100% of the public shares if the Company has not consummated an initial Business Combination within the Completion Window or (B) with respect to any other material provisions relating to shareholders’ rights or pre-initial Business Combination activity; (iii) waive their rights to liquidating distributions from the Trust Account with respect to their founder shares if the Company fails to complete the initial Business Combination within the Completion Window, although they will be entitled to liquidating distributions from the Trust Account with respect to any public shares they hold if the Company fails to complete the initial Business Combination within the Completion Window and to liquidating distributions from assets outside the trust account; and (iv) vote any founder shares held by them and any public shares purchased during or after the Initial Public Offering (including in open market and privately negotiated transactions, aside from shares they may purchase in compliance with the requirements of Rule 14e-5 under the Exchange Act, which would not be voted in favor of approving the Business Combination) in favor of the initial Business Combination.

S-K 1605, De-SPAC Background and Terms	Sep. 23, 2025
De-SPAC Transactions, Effects [Line Items]
De-SPAC, Security Holders Redemption Rights Summary [Text Block]	Redemption Rights Pursuant to the Cayman Constitutional Documents, a Public Shareholder may request to redeem all or a portion of its Public Shares for cash in connection with the Business Combination. As a Public Shareholder, you will be entitled to receive cash for any Public Shares to be redeemed only if you: (a) (i) hold Public Shares or (ii) hold Public Shares through HCM II Units and elect to separate your HCM II Units into the underlying Public Shares and Public Warrants prior to exercising your redemption rights with respect to the Public Shares; (b) submit a written request to Continental, including the legal name, phone number and address of the beneficial owner of the Public Shares for which redemption is requested, that HCM II redeem all or a portion of your Public Shares for cash; and (c) deliver the certificates for your Public Shares (if any) along with the redemption forms to Continental, physically or electronically through DTC. Public Shareholders must complete the procedures for electing to redeem their Public Shares in the manner described above prior to 5:00 p.m., Eastern Time, on October 16, 2025 (two (2) Business Days before the initial scheduled date of the extraordinary general meeting) in order for their Public Shares to be redeemed. Therefore, the election to exercise redemption rights occurs prior to the Domestication. HCM II expects redemptions to occur during the fourth quarter of 2025. For the purposes of the Cayman Constitutional Documents, the exercise of redemption rights will be treated as an election to have such Public Shares redeemed for cash and references in this proxy statement/prospectus to “redemption” or “redeeming” will be interpreted accordingly. Public Shareholders may elect to redeem all or a portion of the Public Shares held by them, regardless of if or how they vote in respect of the Business Combination Proposal. If the Business Combination is abandoned, the Public Shares will be returned to the respective holder, broker or bank. If the Business Combination is consummated, and if a Public Shareholder properly exercises its redemption rights to redeem all or a portion of the Public Shares that it holds and timely delivers the certificates for its shares (if any) along with the redemption forms to Continental, HCM II will redeem such Public Shares for the Redemption Price, a per-share price, payable in cash, equal to the pro rata portion of the Trust Account, calculated as of two (2) Business Days prior to the consummation of the Business Combination. For illustrative purposes, as of the Record Date, this would have amounted to approximately $10.54 per issued and outstanding Public Share. If a Public Shareholder exercises its redemption rights in full, then it will be electing to exchange its Public Shares for cash and will no longer own Public Shares. If you hold the shares in “street name”, you will have to coordinate with your broker to have your shares certificated or delivered electronically. Shares that have not been tendered (either physically or electronically) in accordance with these procedures will not be redeemed for cash. There is a nominal cost associated with this tendering process and the act of certificating the shares or delivering them through DTC’s deposit withdrawal at custodian (“DWAC”) system. Continental will typically charge the tendering broker $100, and it would be up to the broker to decide whether to pass this cost on to the redeeming shareholder. In the event the Business Combination is not consummated this may result in an additional cost to shareholders for the return of their Public Shares. Any request for redemption, once made, may be requested to be withdrawn at any time until the deadline for exercising redemption requests and thereafter, with HCM II’s consent, until the Redemption. However, no withdrawal will be permitted unless the HCM II Board determines (in its sole discretion) to permit the withdrawal of such redemption request (which it may do in whole or in part). Furthermore, if a holder of a Public Share delivers its share certificates (if any) along with the redemption forms in connection with an election of its redemption and subsequently decides prior to the applicable date not to elect to exercise such rights, it may simply request that HCM II permit the withdrawal of the redemption request and instruct Continental to return the certificate (physically or electronically). The holder can make such request by contacting Continental at the address or email address listed in this proxy statement/prospectus. Any corrected or changed written exercise of redemption rights must be received by Continental prior to the vote taken on the Business Combination Proposal at the extraordinary general meeting. No request for redemption will be honored unless the holder’s Public Shares have been delivered (either physically or electronically) to Continental at least two (2) Business Days prior to the initial scheduled date of the extraordinary general meeting. Notwithstanding the foregoing, a Public Shareholder, together with any affiliate of such Public Shareholder or any other person with whom such Public Shareholder is acting in concert or as a “group” (as defined in Section 13(d)(3) of the Exchange Act), will be restricted from redeeming its Public Shares with respect to more than an aggregate of 15% of the Public Shares. Accordingly, if a Public Shareholder, alone or acting in concert or as a group, seeks to redeem more than 15% of the Public Shares, then any such shares in excess of that 15% limit would not be redeemed for cash. Our Sponsor, officers and directors have agreed to, among other things, vote in favor of the Business Combination and waive their redemption rights in connection with the consummation of the Business Combination with respect to any HCM II Ordinary Shares held by them. None of our Sponsor, directors or officers received separate consideration for their waiver of redemption rights. The Founder Shares held by our Sponsor and independent directors will be excluded from the pro rata calculation used to determine the per-share Redemption Price. As of the Record Date, the Sponsor and the HCM II independent directors owned in aggregate approximately 20% of the issued and outstanding HCM II Ordinary Shares. Holders of the HCM II Warrants will not have redemption rights with respect to the HCM II Warrants. The closing price of Public Shares on September 22, 2025, the most recent practicable date prior to the date of this proxy statement/prospectus, was $15.14. As of the Record Date, funds in the Trust Account totaled $242,511,057.72 and were comprised entirely of U.S. government treasury obligations with a maturity of 185 days or less or of money market funds meeting certain conditions under Rule 2a-7 under the Investment Company Act, which invest only in direct U.S. government treasury obligations, or approximately $10.54 per issued and outstanding Public Share. Prior to exercising redemption rights, Public Shareholders should verify the market price of the Public Shares as they may receive higher proceeds from the sale of their Public Shares in the public market than from exercising their redemption rights if the market price per share is higher than the Redemption Price. HCM II cannot assure its shareholders that they will be able to sell their Public Shares in the open market, even if the market price per share is higher than the Redemption Price, as there may not be sufficient liquidity in its securities when its shareholders wish to sell their Public Shares.
De-SPAC, Security Holders are Entitled to Redemption Rights [Flag]	true
De-SPAC Transaction, Accounting Treatment [Text Block]	For the purposes of the Cayman Constitutional Documents, the exercise of redemption rights will be treated as an election to have such Public Shares redeemed for cash and references in this proxy statement/prospectus to “redemption” or “redeeming” will be interpreted accordingly.
De-SPAC, Security Holders are Entitled to Appraisal Rights [Flag]	true
De-SPAC, Security Holders Appraisal Rights Summary [Text Block]	Neither HCM II’s shareholders nor the holders of HCM II Warrants have appraisal rights in connection with the Business Combination or the Domestication under Cayman Islands law or under the DGCL.

Subsequent Events (Details) - $ / shares	Jun. 30, 2025	Dec. 31, 2024
Class A Ordinary Shares [Member]
Subsequent Events [Line Items]
Par value per share	$ 0.0001	$ 0.0001
Common Stock [Member]
Subsequent Events [Line Items]
Par value per share		$ 0.0001

Fair Value Measurements - Schedule of Company’s Assets that are Measured at Fair Value (Details) - USD ($)	Aug. 19, 2024	Jun. 30, 2025	Dec. 31, 2024
Level 1 [Member]
Assets:
Money market mutual fund held in Trust Account		$ 240,134,175	$ 235,193,585
Level 3 [Member]
Assets:
Money market mutual fund held in Trust Account
Level 3 [Member] \| Class A Ordinary Shares Subject to Redemption [Member]
Equity:
Fair value of Public Warrants for Class A ordinary shares subject to redemption allocation	$ 529,000

Restatement of Previously Issued Financial Statements

12 Months Ended

Dec. 31, 2024

Restatement of Previously Issued Financial Statements [Abstract]

RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS

NOTE 2. RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS

The original footnote disclosure within Note 5. Related Party Transactions of the Original 10-K incorrectly described a transaction with its underwriter as a related party transaction. This description was incorrect. There is no impact on the Company’s balance sheet, statement of operations, cash flows, or shareholders’ equity as a result of this correction.

Accordingly, the previously issued financial statements as of December 31, 2024 and for the period from April 4, 2024 have been restated to remove the incorrect footnote disclosure. No other changes were required.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

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-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480530/250-10-S99-6

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (f)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 250
-Publisher FASB
-URI https://asc.fasb.org/250/tableOfContent

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

+ Details

Shareholders’ Deficit (Details) - USD ($)

3 Months Ended

6 Months Ended

9 Months Ended

Apr. 08, 2024

Jun. 30, 2024

^[1]

Jun. 30, 2025

Dec. 31, 2024

Shareholders’ Deficit [Line Items]

Preference shares, shares authorized

1,000,000

Preference shares, par value (in Dollars per share)

$ 0.0001

Preference shares, shares issued

Preference shares, shares outstanding

Shares issued value (in Dollars)

$ 25,000

^[2]

Percentage of common stock issuance

20.00%

Common stock voting rights

one

Affirmative vote of at least percentage

90.00%

Sponsor [Member]

Shareholders’ Deficit [Line Items]

Shares issued

25,000

Share price (in Dollars per share)

$ 0.004

Business Combination [Member]

Shareholders’ Deficit [Line Items]

Percentage of voting interests

50.00%

Class A Ordinary Shares [Member]

Shareholders’ Deficit [Line Items]

Ordinary shares, shares authorized

200,000,000

Ordinary shares, par value (in Dollars per share)

$ 0.0001

Ordinary shares, shares issued

Ordinary shares, shares outstanding

Ordinary shares subject to possible redemption shares

23,000,000

Class B Ordinary Shares [Member]

Shareholders’ Deficit [Line Items]

Ordinary shares, shares authorized

20,000,000

Ordinary shares, par value (in Dollars per share)

$ 0.0001

Ordinary shares, shares issued

5,750,000

Ordinary shares, shares outstanding

5,750,000

Class B Ordinary Shares [Member] | Sponsor [Member]

Shareholders’ Deficit [Line Items]

Shares issued

5,750,000

Shares issued value (in Dollars)

$ 25,000

Share price (in Dollars per share)

$ 0.004

Sponsor [Member]

Shareholders’ Deficit [Line Items]

Shares issued

25,000

Share price (in Dollars per share)

$ 0.004

Sponsor [Member] | Class B Ordinary Shares [Member]

Shareholders’ Deficit [Line Items]

Shares issued

5,750,000

Shares issued value (in Dollars)

$ 25,000

Share price (in Dollars per share)

$ 0.004

[1]

[2]

Summary of Significant Accounting Policies - Schedule of Basic and Diluted Net Income Per Ordinary Share (Details) - USD ($)

3 Months Ended

6 Months Ended

9 Months Ended

Jun. 30, 2025

Jun. 30, 2024

Jun. 30, 2025

Dec. 31, 2024

Class A [Member]

Numerator:

Allocation of net income

$ 480,822

$ 1,032,821

$ 2,325,597

Denominator:

Basic weighted average shares outstanding

23,000,000

11,372,694

Basic net income per ordinary share

$ 0.02

$ 0.04

$ 0.2

Class B [Member]

Numerator:

Allocation of net income

$ 120,205

$ (52,663)

$ 258,205

$ 1,083,191

Denominator:

Basic weighted average shares outstanding

5,750,000

^[1]

5,000,000

^[1]

5,750,000

^[1]

5,297,048

Basic net income per ordinary share

$ 0.02

$ (0.02)

$ 0.04

$ 0.2

[1]

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

+ Details

- Definition

Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

+ References

+ Details

Condensed Consolidated Statement of Operations (Unaudited) - USD ($)

3 Months Ended

6 Months Ended

9 Months Ended

Jun. 30, 2025

Jun. 30, 2024

Jun. 30, 2025

Dec. 31, 2024

General and administrative costs

$ 1,489,307

$ 52,663

$ 2,592,440

$ 634,797

Loss from operations

(1,489,307)

(52,663)

(2,592,440)

(634,797)

Other income (expense):

Interest earned on marketable securities held in Trust Account

2,477,726

4,940,590

4,043,585

Initial loss on forward purchase agreement liability

(893,425)

Change in fair value of forward purchase agreement liability

(387,392)

(163,699)

Total other income, net

2,090,334

3,883,466

4,043,585

Net income (loss)

$ 601,027

$ (52,663)

$ 1,291,026

$ 3,408,788

Class A Ordinary Shares

Other income (expense):

Weighted average shares outstanding, Basic (in Shares)

23,000,000

11,372,694

Basic net income (loss) per ordinary share (in Dollars per share)

$ 0.02

$ 0.04

$ 0.2

Weighted average shares outstanding, Diluted (in Shares)

23,000,000

Diluted net income (loss) per ordinary share (in Dollars per share)

$ 0.02

$ 0.04

$ 0.2

Class B Ordinary Shares

Other income (expense):

Weighted average shares outstanding, Basic (in Shares)

5,750,000

^[1]

5,000,000

^[1]

5,750,000

^[1]

5,297,048

Basic net income (loss) per ordinary share (in Dollars per share)

$ 0.02

$ (0.02)

$ 0.04

$ 0.2

Weighted average shares outstanding, Diluted (in Shares)

5,750,000

5,000,000

5,750,000

Diluted net income (loss) per ordinary share (in Dollars per share)

$ 0.02

$ (0.02)

$ 0.04

$ 0.2

[1]

S-K 1604(c) De-SPAC Dilution $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2025 USD ($) $ / shares shares
No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Per Share (in Dollars per share) \| $ / shares	$ 10
De-SPAC, Net Tangible Book Value, Adjusted	$ 273,765
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	33,750,000
De-SPAC, Net Tangible Book Value, Adjusted, Per Share (in Dollars per share) \| $ / shares	$ 8.11
De-SPAC, Net Tangible Book Value, Amount of Dilution Per Share (in Dollars per share) \| $ / shares	$ 1.89
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 1,051,315
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	105,131,475
Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Per Share (in Dollars per share) \| $ / shares	$ 10
De-SPAC, Net Tangible Book Value, Adjusted	$ 238,732
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	30,394,497
De-SPAC, Net Tangible Book Value, Adjusted, Per Share (in Dollars per share) \| $ / shares	$ 7.85
De-SPAC, Net Tangible Book Value, Amount of Dilution Per Share (in Dollars per share) \| $ / shares	$ 2.15
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 1,017,760
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	101,775,972
Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Per Share (in Dollars per share) \| $ / shares	$ 10
De-SPAC, Net Tangible Book Value, Adjusted	$ 203,698
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	27,038,993
De-SPAC, Net Tangible Book Value, Adjusted, Per Share (in Dollars per share) \| $ / shares	$ 7.53
De-SPAC, Net Tangible Book Value, Amount of Dilution Per Share (in Dollars per share) \| $ / shares	$ 2.47
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 948,205
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	98,420,468
Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Per Share (in Dollars per share) \| $ / shares	$ 10
De-SPAC, Net Tangible Book Value, Adjusted	$ 168,665
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	23,683,490
De-SPAC, Net Tangible Book Value, Adjusted, Per Share (in Dollars per share) \| $ / shares	$ 7.12
De-SPAC, Net Tangible Book Value, Amount of Dilution Per Share (in Dollars per share) \| $ / shares	$ 2.88
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 950,650
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	95,064,965
Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Per Share (in Dollars per share) \| $ / shares	$ 10
De-SPAC, Net Tangible Book Value, Adjusted	$ 133,631
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	20,327,986
De-SPAC, Net Tangible Book Value, Adjusted, Per Share (in Dollars per share) \| $ / shares	$ 6.57
De-SPAC, Net Tangible Book Value, Amount of Dilution Per Share (in Dollars per share) \| $ / shares	$ 3.43
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 917,095
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	91,709,461
Public Units [Member] \| No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	23,000,000
Public Units [Member] \| Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	19,644,497
Public Units [Member] \| Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	16,288,993
Public Units [Member] \| Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	12,933,490
Public Units [Member] \| Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	9,577,986
Founder Shares [Member] \| No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,750,000
Founder Shares [Member] \| Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,750,000
Founder Shares [Member] \| Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,750,000
Founder Shares [Member] \| Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,750,000
Founder Shares [Member] \| Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,750,000
PIPE Shares [Member] \| No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,000,000
PIPE Shares [Member] \| Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,000,000
PIPE Shares [Member] \| Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,000,000
PIPE Shares [Member] \| Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,000,000
PIPE Shares [Member] \| Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Number of Shares Used to Determine Net Tangible Book Value, Adjusted (in Shares) \| shares	5,000,000
HCM II Shares [Member] \| No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 337,500
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	33,750,000
HCM II Shares [Member] \| Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 303,945
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	30,394,497
HCM II Shares [Member] \| Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 270,390
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	27,038,993
HCM II Shares [Member] \| Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 236,835
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	23,683,490
HCM II Shares [Member] \| Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 203,280
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	20,327,986
Terrestrial Energy Shares [Member] \| No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 713,815
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	71,381,475
Terrestrial Energy Shares [Member] \| Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 713,815
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	71,381,475
Terrestrial Energy Shares [Member] \| Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 713,815
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	71,381,475
Terrestrial Energy Shares [Member] \| Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 713,815
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	71,381,475
Terrestrial Energy Shares [Member] \| Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Company Valuation at which Shares not Redeemed are at least IPO Value per Share	$ 713,815
De-SPAC, Number of Shares Used, Adjustment (in Shares) \| shares	71,381,475
HCM II’s Net Tangible Book Value [Member] \| No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	$ (13,956)
HCM II’s Net Tangible Book Value [Member] \| Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	(13,956)
HCM II’s Net Tangible Book Value [Member] \| Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	(13,956)
HCM II’s Net Tangible Book Value [Member] \| Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	(13,956)
HCM II’s Net Tangible Book Value [Member] \| Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	(13,956)
Transaction Costs Attributed to HCM II [Member] \| No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	(3,470)
Transaction Costs Attributed to HCM II [Member] \| Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	(3,470)
Transaction Costs Attributed to HCM II [Member] \| Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	(3,470)
Transaction Costs Attributed to HCM II [Member] \| Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	(3,470)
Transaction Costs Attributed to HCM II [Member] \| Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	(3,470)
PIPE Financing [Member] \| No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	51,057
PIPE Financing [Member] \| Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	51,057
PIPE Financing [Member] \| Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	51,057
PIPE Financing [Member] \| Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	51,057
PIPE Financing [Member] \| Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	51,057
Funds Released from Trust [Member] \| No Redemption [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	240,134
Funds Released from Trust [Member] \| Redemption at 25 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	205,101
Funds Released from Trust [Member] \| Redemption at 50 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	170,067
Funds Released from Trust [Member] \| Redemption at 75 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	135,034
Funds Released from Trust [Member] \| Redemption at 100 Percent of Maximum [Member]
De-SPAC, Net Tangible Book Value [Line Items]
De-SPAC, Net Tangible Book Value, Adjusted	$ 100,000