A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the radar office between 66 and 69 stations on the starboard side of the main flat looking to starboard and aft from the doorway showing three small screen visual display units and a Kelvin Hughes type 1006 radar visual display unit. In the corner is a keel depth gauge marked to 140 feet. A vertical format negative.