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 aft from the centreline at 74 station showing the aft bulkhead at 77 station. The watertight door leading into the generator room is open. An automatic emergency lantern is above the left side of the door. The entrance to the crew's washplace, indicated by the curtain rail, is on the right. A vertical format negative.