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 down and to port from the centreline at 33 station. Against the port side are pipes and valves and a 24 inch non watertight scuttle is in the deck leading down to a store. On the aft bulkhead are two torpedo battery alarm units above a televalve block holding rows of handwheels marked 'Return' and 'Pressure'. A vertical format negative.