The supporting steel structure of the platform which is installed on the seabed.

The lower section, or "legs", of an offshore platform.

Offshore platform consisting of a framework of tubular members with a deck (or decks) on top and piles driven through the framework to fix the structure to the sea bed.

Supporting (concrete base or steel legs) structure for an offshore installation.

The steel lattice structure that supports an offshore platform.

platform underside structure fixed to the seabed using piles.