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 98 station showing the low power control panel on the left and the propulsion motor switchboard is on the right. An automatic emergency lantern is above locker L39 in the centre of the picture and a fire extinguisher is on the forward bulkhead at 92 station. A vertical format negative.