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 port, slightly forward and up on the port side at 108 station showing two BU6 Short boxes, a BU4 box and a B.I.B.S. L.P. pressure gauge above the top bunk of a triple tier bunk unit. Kit locker 112 is also above the bunk.