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 forward and to starboard from 113 station showing four lockers labelled S.E.I.E (submerged escape immersion equipment) 15, 18 and two marked 20. Two lockers marked 'B.U. 6 short' are in the top right. Four cushioned seats and a table/portable berth are in the left foreground. A tube selection unit Mk. 4 model 1 manufactured by Laurence Scott Electromotors Ltd is above a 6-way switch panel against the forward bulkhead. A vertical format negative.