
The company operates globally from its head office in Aberdeen, Scotland, and runs a fleet of four ultra deep-water drillships and three mid-water semi-submersible drilling rigs. One of its mobile offshore drilling rigs is the Stena Clyde, a UK-registered AKER H3 designed semi-submersible, twin pontoon, column-stabilised platform unit. The vessel was commissioned in 1976, and modified in 1985, 1997 and 2015. It is designed for offshore drilling and gas well-testing operations at water depths up to 2700 metres.