A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the radar office between 66 and 69 stations on the starboard side of the main flat looking forward and to starboard showing a distribution box, switch and fuse panels on the left. Against the starboard side of the boat are a cupboard with a closed box unit on top of it and two small screen visual display units. A vertical format negative.