A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the motor room between 92 and 103 stations on the main flat looking forward along the walkway from 103 station. The door in bulkhead 92 leading into the main generator room is open. An automatic emergency lantern and a telephone to the control room are on the right. A tannoy is under the deckhead on the left. A vertical format negative.