DOF ASA, together with its subsidiaries, owns and operates a fleet of offshore/subsea vessels. It operates a fleet of platform supply vessels (PSVs) that are used to transport oilfield products and supplies to offshore drilling and production facilities; anchor handling tug supply (AHTS) vessels used to set anchors for drilling rigs, and tow mobile drilling rigs and equipment from one location to another; and subsea vessels used for a range of subsea services. The company also provides subsea services, including project management, engineering, construction and installation, life-of-field, decommissioning/field abandonment, and survey and positioning, as well as inspection, repair, and maintenance services.