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 on the main flat looking to port, down and aft from the walkway at 94 station showing a double doored locker L42 and chalked on it is 'L6 key 92379' and 'elect spare gear locker 1966/76'. On the left is junction panel V2, an 880 volts unit, sitting on top of a drawer unit in which the drawers are labelled L46, L47 and L48. A vertical format negative.