Oil platform
An oil platform is a large structure placed in the sea. It is used to drill for oil or natural gas at the bottom of the sea. The platform may be attached to the sea floor (stationary)or it might be movable(mobile).
In general, oil platforms are located on the continental shelf. As of 2006, drilling for resources up to 8km away from the platform was possible.
Oil Platform Media
Oil platform P-51 off the Brazilian coast is a semi-submersible platform.
Oil wells just offshore at Summerland, California, before 1906.
Offshore platform, Gulf of Mexico
400 feet (120 m) tall jackup rig being towed by tugboats, Kachemak Bay, Alaska