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 aft, to starboard and up on the port side showing an A.P. 160409 amplifier panel on the aft bulkhead. Two fuse boards, two junction boxes, a box marked 'Electric magnetic log', a main intercom socket box and a blower telemotor lamp box are above a large double doored EM log speed and distance transmitter unit against the inboard bulkhead. A main intercom junction box is under the deckhead.