The Spar platforms are among the largest offshore platforms or constructions in use today. The massive Spar platforms consist of a large cylinder supporting a typical fixed rig platform.

The large cylinder does not extend all the way to the seafbed, but instead is hold to the bottom by several big cables and lines. The large cylinder stabilize the Spar platforms in the water, and allows for horizontal and vertical movement to absorb the force of extreme weather conditions as hurricanes.