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 slightly to port, aft and down from the centreline at 102 station showing pipes, valves and handwheels against the aft bulkhead above the inner hull plating. Near the foot of a vertical steel ladder is the cable cutter rotary stop valve. The end of the port main motor is on the left. A vertical format negative.