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 aft and up from the centreline at 31 station showing the open watertight door in 34 station with canvas hoses coming through it. Above the door are pipes, a tannoy, handwheels, main intercom junction box 10 and main intercom socket box (1). A vertical format negative.