A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the aft torpedo compartment between 108 and 117 stations on the main flat looking to port from 113 station showing the steering gear local control unit against the port side of the boat which includes depth gauges, hydroplane order indicator, steering order indicator, bearing compass, clinometer, telephone and intercom microphone. A vertical format negative.