HMS Ocean moored at Greenwich,during it's pre-Olympics exercise. see http://www.royalnavy.mod.uk/The-Fleet/Ships/Assault-Ships/HMS-Ocean see http://www.telegraph.co.uk/news/newsvideo/9245926/London-2012-Olympics-HMS-Ocean-squeezes-through-the-Thames-Barrier.html see http://forum.keypublishing.com/showthread.php?t=116569