A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the motor room between 92 and 103 stations on the main flat looking up at the port side of the deckhead between 95 and 96 stations from the walkway. On the left are a junction box above a distribution panel. On the deckhead and boat's side are units marked 'ALK winch control ct socket box', 'ALK float circuits junction box 2', 'charging board', 'headset connection box 1 generator room motor room intercom' and a fuse distribution box. A vertical format negative.