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 73 station showing the door into the galley on the left with various distribution boxes and fuse boxes beyond. The watertight door in the bulkhead at 77 station is open and an automatic emergency lantern is above it. A vertical format negative.