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 on the main flat looking to port, aft and down from the port side at 64 station showing the 'O' tank trim pump handwheel box in the upper left of the picture with the snort masts control valves below it. A number of gauges and handwheels are against the boat's side. The vertical high pressure direct blow main panels are on the right with the gauges for Q, D1 and D2 tanks between them. The left DB main panel has five taps labelled 1, 2, 4, 6 and 7 and the right panel has three taps labelled Q, D1 and D2.