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Receivables and Prepayments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Receivables and Prepayments
Taxes and other receivables	$ 249	$ 467
Prepayments	1,602	1,511
Total	$ 1,851	$ 1,978

X

- Definition

Prepayments.

+ References

No definition available.

+ Details

Name:	tmc_Prepayments
Namespace Prefix:	tmc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Carrying amount as of the balance sheet date of taxes and receivables classified as other, due within one year or the operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	tmc_TaxesAndOtherReceivablesCurrent
Namespace Prefix:	tmc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherReceivablesNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant