A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the forward torpedo compartment looking forward and up from the centreline between the torpedo tubes at 20 station showing the T.C.S.S. 9 torpedo order indicator mark 3 model 1 TC1257. Below it are six control levers for the torpedo tube bow caps. At the bottom is the the panel holding the main pressure charge gauge and the six reservoir pressure gauges. A vertical format negative.