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, down and to port into the port inboard corner showing the Powquip teleprinter No. 1 and below it is a teleprinter terminal and a BID type 580 unit with a National Security Agency plaque on it. To the right of the door are a Storno unit, a lighting switch and a fire extinguisher. A vertical format negative.