The submarine was already embroiled in controversy over an alleged affair between its captain, Commander Stuart Armstrong, 41, and Sub-Lieutenant Rebecca Edwards, 25. Again, both have been removed from duty on board.

The submarine‘s captain and his second-in-command are the only officers on board with access to a grey safe which contains a ‚letter of last resort‘ from the Prime Minister. It details guidance and orders to be followed should the UK be attacked with nuclear weapons.