A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the forward torpedo compartment looking to starboard and up from the port side between 22 and 23 stations showing the torpedo tube doors on the left and the reload racks on the right. Fitted to the starboard side are a large number of electrical and hydraulic units, gauges, controls and two telephones.