A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the control room between 59 and 69 stations looking forward and to starboard from 61 station showing the Mark 17 T.C.C. unit manufactured by Laurence Scott & Electromotors on the left with the Mark 1 torpedo order firing unit next to it. The torpedo guidance control unit on the extreme right. Various fuse boxes and junction panels are against the forward bulkhead and the starboard side of the boat. An electrical power cable stowage container is on the deck next to the battery compartment hatch. A vertical format negative.