A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the auxiliary machinery space between 62 and 68 stations below the main flat looking to starboard on the port side showing a fuse board, a box marked 'Electric magnetic log', a main intercom socket box and a blower telemotor lamp box above a large double doored EM log speed and distance transmitter unit against the inboard bulkhead. The radar mast well is on the left. A vertical format negative.