A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the forward accommodation passage between 42 and 49 stations on the port side of the main flat looking aft and to starboard from 47 station showing the closed watertight door in the bulkhead at 49 station. On the left are a loudspeaker, an automatic emergency lantern, a fire hose stowage cage and four Nu-Swift fire extinguisher cartridges. A vertical format negative.