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Significant Accounting Estimates and Judgements (Details)	12 Months Ended
	Dec. 31, 2024 D item $ / shares
Significant Accounting Estimates and Judgements
Issue price per share | $ / shares	$ 18
Trading days for redemption of public warrants	20
Consecutive trading days for redemption of public warrants	30
Number of trials for warrants valuation | item	250,000

X

- Definition

The number of trials for warrants valuation.

+ References

No definition available.

+ Details

Name:	tmc_NumberOfTrialsForWarrantsValuation
Namespace Prefix:	tmc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	tmc_SignificantAccountingEstimatesAndJudgementAbstract
Namespace Prefix:	tmc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The issuance price of additional capital which would trigger an adjustment in the exercise price of the warrant.

+ References

No definition available.

+ Details

Name:	tmc_WarrantExercisePriceAdjustmentTrigger
Namespace Prefix:	tmc_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of consecutive trading days within a specified range when the reported sale price must exceed the specified amount.

+ References

No definition available.

+ Details

Name:	tmc_WarrantRedemptionMeasurementConsecutiveTradingDaysOverSpecifiedAmount
Namespace Prefix:	tmc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of trading days over which the reported sale price is measured when determining the redemption price.

+ References

No definition available.

+ Details

Name:	tmc_WarrantRedemptionMeasurementPeriod
Namespace Prefix:	tmc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration