A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the bridge fin between 59½ and 76 stations at superstructure deck level looking aft from the port side abaft the conning tower. On the left are the attack periscope in the foreground with the radar periscope, the air/sea guard mast, the Ademar mast and the snort induction mast in order beyond. A vertical format negative.