Olympus tension leg platform
Olympus is a tension leg platform oil rig, planned as a further development of the Mars field (hence "Mars B"). == Design == Olympus is a Tension Leg Platform, with 24 wells; added to Mars A, this means a combined 48 wells and more than 350,000 barrels (56,000 cubic metres) per day of oil equivalent capacity.
Source: Wikipedia — Olympus tension leg platform (CC BY-SA 4.0)