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 and up from the walkway at 103 station showing an automatic emergency lantern and a telephone to the control room by the side of the main power switchboard and control station. A tannoy is under the deckhead on the port side of the walkway. A vertical format negative.