A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the aft torpedo compartment between 108 and 117 stations on the main flat looking to starboard from 113 station showing an intercom loudspeaker over the torpedo order indicator Mk. 4 model 1 which is above a power supply panel. An automatic emergency lantern is on the right. Lockers are on the left, including two marked 'B.U. 6 short'. A vertical format negative.