A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the wireless telegraphy office between 69 and 72½ stations on the starboard side of the main flat looking forward, up and to port into the port inboard corner showing the Powquip teleprinter No. 1 and above it is a signal distribution panel for types 580 and 660. To the right of the door are two Storno units and a lighting switch. A vertical format negative.