Exhibit 99.1 PRESS RELEASE SEACOR MARINE ANNOUNCES FOURTH QUARTER 2023 RESULTS Houston, Texas February 29, 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 fourth quarter ended December 31, 2023. SEACOR Marine’s consolidated operating revenues for the fourth quarter of 2023 were $73.1 million, operating income was$ ...