Exhibit 16.1

September 15, 2021

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Commissioners:

We have read the statements made by TMC the metals company, Inc. (formerly known as Sustainable Opportunities Acquisition Corp.) under Item 4.01 of its Form 8-K dated September 9, 2021. We agree with the statements concerning our Firm in such Form 8-K; we are not in a position to agree or disagree with other statements of TMC the metals company, Inc. (formerly known as Sustainable Opportunities Acquisition Corp.) contained therein.

Very truly yours,

/s/ Marcum LLP

Marcum LLP