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 starboard from the port side at 93 station showing a row of batteries against the bulkhead at 92 station. On the right are motor generators with the main motor cooler trunking above. A vertical format negative.