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 up into the forward starboard corner. The gyro compass master unit is on the left with three test sockets and the E.M. log probe connection box above it. Cupboard three is in the corner and on the right are a Plessey Dynamics static converter Mk. 7VC and an Admiralty gyro compass repeater panel. A vertical format negative.