United States securities and exchange commission logo December 8, 2021 Jes s Llorca Chief Financial Officer SEACOR Marine Holdings Inc. 12121 Wickchester Lane Suite 500 Houston, TX 77079 Re: SEACOR Marine Holdings Inc. Form 10-K for the Fiscal Year Ended December 31, 2020 Filed March 12, 2021 File No. 001-37966 Dear Mr. Llorca: We have reviewed your filing and have the following comment. In our comment, we may ask you to provide us with information so we may better understand your disclosure. Please respond to this comment within ten business days by providing the requested information or advise us as soon as possible when you will respond. If you do not believe our comment applies to your facts and circumstances, please tell us why in your response. After reviewing your response to the comment, we may have additional comments. Form 10-K for the Fiscal Year Ended December 31, 2020 Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations Certain Components of Revenues and Expenses Direct Vessel Profit, page 43 1. We note you have identified the measure Direct Vessel Profit (DVP) as a non-GAAP measure when applied to individual vessels, fleet categories or the combined fleet. You disclose that DVP is defined as operating revenues less direct operating expenses excluding leased-in equipment expense. We also note your disclosure that DVP has some limitations in that it does not take into account all expense related to the operation of the fleet and, more significantly, the Company. Please address the following related to this measure: Clarify if the operating revenues used in your calculation of DVP include leased-in equipment revenue. To the extent operating revenues include revenue from leased-in Jes s Llorca SEACOR Marine Holdings Inc. December 8, 2021 Page 2 equipment, please explain why you believe it is appropriate to exclude the related costs and expenses in your non-GAAP presentation. Tell us how you considered reconciling DVP to the most directly comparable GAAP measure, fully loaded GAAP gross margin. Refer to Item 10(e)(1)(i)(B) of Regulation S-K. We remind you that the company and its management are responsible for the accuracy and adequacy of their disclosures, notwithstanding any review, comments, action or absence of action by the staff. You may contact Myra Moosariparambil at 202-551-3796 or Craig Arakawa at 202-551- 3650 if you have questions regarding the comment. FirstName LastNameJes s Llorca Sincerely, Comapany NameSEACOR Marine Holdings Inc. Division of Corporation Finance December 8, 2021 Page 2 Office of Energy & Transportation FirstName LastName