The Maureen Alpha
The Maureen was one of a kind. A 'Technomara Gravity Structure', the deck was built in the Howard Doris Kishorn yard in Scotland. The 3 tanks on the jacket could be ballasted so that the entire structure could float. After the mating of deck and jacket in Loch Kishorn, the structure was towed out to the Maureen field and ballast pumped into the tanks to increase it's weight and allow it to settle on the sea bed.
Some 18 years later, with the field exhausted, in an operation no-one was certain would succeed, the tanks were de-ballasted and the 112,000 ton platform floated once again.
Picture added on 03 November 2006