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 to starboard from 61 station showing the torpedo guidance control unit on the right. The No. 4 main tank vent valve and various fuse boxes and junction panels are against the starboard side of the boat. An electrical power cable stowage container is on the deck in the foreground. A vertical format negative.