A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the gyro compass room between 65 and 68 stations below the main flat, looking towards the port bulkhead showing the gyro compass amplifier unit with the gyro compass power distribution panel below and two fuse boxes above. The compass retransmission unit is on the left and on the right is a cupboard unit, labelled cupboard one and cupboard two, with an ashtray mounted on the door. A vertical format negative.