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 on the main flat looking to port and up from 63½ station showing a telemotor control box on the left, a telemotor accumulator charged indicator box , an hydrogen fan clearing switch box, a distribution box, a group of five fuse boxes, six tank gauges and a broadcast and intercom control box.