A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the control room between 59 and 69 stations looking to starboard and down from 61 station showing the forward end of the main action console and chart table. To the left of the table is the torpedo guidance control unit with a telephone by the side of it. Maintenance work is being carried out and coils of wire are on the chart table. Two large tool chests are on the deck. A vertical format negative.