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 to port from the centreline at 96 station showing No. 2 225v 100KW motor generator set on the right with locker L12 above it. On the port side is No. 4 205v 400 Hz 15 KVA motor generator. Locker L25 is in the left foreground with the forward end of the port main motor beyond it. A vertical format negative.