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 down and to starboard into the starboard forward corner showing jointed pipework and a handwheel on which is inscribed 'A.S. SUP TO M.N.KTB.A/CLR.STBD.FWD'. A vertical format negative.