A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the control room passage between 69 and 77 stations on the main flat looking aft and to starboard from the entrance to the crew's washplace at 76 station showing fuse panels, distribution boxes, screened cable changing box No. 6 and a cabinet holding damage control breathing apparatus. The watertight door in the bulkhead at 77 station is on the right with an automatic emergency lantern above it. A vertical format negative.