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 passage between 69 and 77 stations on the main flat looking to starboard, slightly forward and down from the entrance to the crew's washplace at 76 station showing distribution boxes C3C and C4C above two Allen West & Co Ltd fuse boxes with an unidentified indicator unit just above deck level. A fire extinguisher is between these units and the fuse panels M1 and M2. A vertical format negative.