Gravity-based structure
Image:Oil platform Norway.jpg|thumb|right|A Condeep type GBS under construction in Norway
A gravity-based structure is a support structure held in place by gravity, most notably offshore oil platforms. These structures are often constructed in fjords due to their protected area and sufficient depth.
Offshore oil platforms
Prior to deployment, a study of the seabed must be done to ensure it can withstand the vertical load from the structure. It is then constructed with steel reinforced concrete into tanks or cells, some of which are used to control the buoyancy. When construction is complete, the structure is towed to its intended location.Notable GBSs include the 1997 Hibernia Gravity Base Structure off Newfoundland. Around 2020 GBSes became the fashion for Novatek's exploitation of the petroleum resources in the Gulf of Ob.