A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the aft auxiliary machinery and gland space (thrust block compartment) between 103 and 107 stations below the main flat. He is looking to starboard and forward showing a nest of storage drawers against the forward bulkhead. A Johnson lathe is in the foreground with the starboard propeller shaft torsionmeter beyond it. A large air bottle is against the boat's side.