Exhibit 99.1 PRESS RELEASE SEACOR MARINE ANNOUNCES FIRST QUARTER 2024 RESULTS Houston, Texas May 1, 2024 FOR IMMEDIATE RELEASE - SEACOR Marine Holdings Inc. (NYSE: SMHI) (the “Company” or “SEACOR Marine”), a leading provider of marine and support transportation services to offshore energy facilities worldwide, today announced results for its first quarter ended March 31, 2024. SEACOR Marine’s consolidated operating revenues for the first quarter of 2024 were $62.8 million, operating loss was$10.6 million, ...