A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the aft crew accommodation space between 103 and 117 stations on the main flat looking forward from the centreline at 105 station showing the open watertight door in the bulkhead at 103 station, leading into the motor room. Above the door are a telephone and various valve handwheels. On the right are the controls for the rush escape tower and an automatic emergency lantern. A vertical format negative.