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 below the main flat looking aft, to starboard and down from to port of the centreline at 94 station showing the flexible rubber mountings of a 100 KW DC/AC motor generator manufactured by Serck on the left with a steel ladder leading up to the main flat. In the right foreground is a low power motor generator.