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, to starboard and down from the entrance to the crew's washplace at 76 station showing fuse panels M1 to M4 and a cabinet holding damage control breathing apparatus. The watertight door in the bulkhead at 77 station is on the right. A vertical format negative.