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Cover
Nov. 11, 2021
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 11, 2021
Entity File Number 001-39281
Entity Registrant Name TMC the metals Co Inc.
Entity Central Index Key 0001798562
Entity Tax Identification Number 00-0000000
Entity Incorporation, State or Country Code A1
Entity Address, Address Line One 595 Howe Street
Entity Address, Address Line Two 10th Floor
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Postal Zip Code V6C 2T5
City Area Code 604
Local Phone Number 631-3115
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
TMC Common Shares without par value [Member]  
Document Information [Line Items]  
Title of 12(b) Security TMC Common Shares without par value
Trading Symbol TMC
Security Exchange Name NASDAQ
Redeemable warrants, each whole warrant exercisable for one TMC Common Share, each at an exercise price of $11.50 per share [Member]  
Document Information [Line Items]  
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one TMC Common Share, each at an exercise price of $11.50 per share
Trading Symbol TMCWW
Security Exchange Name NASDAQ