Thought this might give our resident submariners some strange feelings in their nether regions 
http://www.royalnavy.mod.uk/news-and-events/rn-live/all-news/black-to-black/*/changeNav/6568
http://www.royalnavy.mod.uk/news-and-events/rn-live/all-news/black-to-black/*/changeNav/6568