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 crew accommodation space between 103 and 117 stations on the main flat looking to starboard, forward and down from the centreline at 105 station showing a triple tier bunk unit. Against the boat's side is a distribution box CSD above two lockers and a panel covering the escape tower portable drain. A vertical format negative.