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 crew accommodation space between 103 and 117 stations on the main flat looking to starboard and up from the port side at 107 station showing the pipework and valves of the B.I.B.S. (built-in breathing system) panel above wooden lockers. A triple tier bunk unit is on the right.