SEACOR Marine Holdings Inc. provides marine and support transportation services to offshore oil, natural gas, and windfarm facilities worldwide. Its offshore support and specialty vessels deliver cargo and personnel to offshore installations, including wind farms; handle anchors and mooring equipment required to tether rigs to the seabed; assist in placing them on location and moving them between regions; provide construction, well work-over, maintenance, and decommissioning support; and carry and launch equipment used underwater in drilling and well installation, maintenance, inspection, and repair, as well as offer accommodations for technicians and specialists, safety support, and emergency response services. As of December 31, 2021, the company operated a fleet of 81 support and specialty vessels, of which 60 were owned or leased-in, 20 were joint-ventured, and 1 was managed on behalf of unaffiliated third parties. It serves integrated oil companies, large independent oil and natural gas exploration and production companies, and emerging independent companies, as well as windfarm operations and installation contractors. The company was founded in 1989 and is headquartered in Houston, Texas.