Semi-submersibles are particularly suited to a number of offshore support vessel roles because of their good stability, large deck areas, and variable deck load (VDL). Some of the most prominent vessels are;
• Uncle John – Diving / Construction support vessel, built for Houlder Offshore in 1977[6]
• Seaway Swan – Diving Support Vessel built in 1977
• Tharos – Offshore Safety support vessel, built in 1979 and since converted into a drilling vessel, and rechristened Transocean Marianas.
• Stadive – Diving Support Vessel (DSV) built for Shell in 1982[7]
• Iolair – Offshore safety support vessel, built for BP in 1982
• Safe Karinia – Offshore operations vessel, built in 1982
• Polyconfidence – Offshore accommodation platform, built in 1988.
• Q4000 – Offshore Multiservice Vessel, built for Caldive in 2002[8]
• Ocean Odyssey – Converted semi-submersible drilling rig used as a rocket launch pad
