A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the officers' washplace between 69 and 74 stations on the port side of the main flat looking to port and up into water closet number 3 (noted as trap 3 by the photographer). Three cylinders are in a rack by the side of the pan at the bottom of the picture. A telemotor control fuse panel is under the deckhead. A vertical format negative.