North Star Island, an artificial island off the coast of Prudhoe Bay, Alaska. The island was made to develop the North Star oil pool, located 12,500 feet (3,800 m) below the seabed, discovered in 1984 by Royal Dutch Shell and later purchased and developed by BP (British Petroleum).
A stable year-round artificial island was built, rather than a standard drilling platform, as it was the only way to provide the permanent structures needed to cope with the annual formation of pack ice close to the northern Alaska coast.
Because of the distance from shore it uses a subsea pipeline to transport oil to shore, rather than causeway like Endicott island, and then into the Trans-Alaska Pipeline System.