A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the radar office between 66 and 69 stations on the starboard side of the main flat looking aft, to port and down showing two units in the corner above a power supply unit on the inboard bulkhead. A digital voltmeter is behind the power supply unit. On the right are two test sockets and a test panel for display outfit J.Q. On the left is a Kelvin Hughes Type 1006 radar display unit over a Dynamco digital printer and a transponder. A vertical format negative.