v3.26.1
Basis of Presentation - Non controlling interest (Details)
Dec. 31, 2025
DeepGreen Engineering Pte. Ltd.  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
DeepGreen Metals ULC  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
The Metals Company USA, LLC  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
DeepGreen TOML Holding 1 Ltd.  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
DeepGreen TOML Holding 2 Ltd.  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
DeepGreen TOML Singapore Ltd.  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
Koloa Moana Resources Ltd.  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
Nauru Ocean Resources Inc.  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
Offshore Minerals Pty. Ltd.  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
The Metals Company Australia Pty Ltd  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
TMC The Metals Company UK Limited  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
Tonga Off shore Mining Limited  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%
Seafloor Mineral Ventures  
Basis of Presentation  
Proportion of Interest Held by the Company 100.00%