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 up from the port side at 64 station showing the 'O' tank trim pump handwheel box in the lower left of the picture. A large number of gauges and handwheels are against the boat's side. The top of the vertical high pressure direct blow main panel is on the right with the gauge for Q tank next to it. A blower telegraph transmitter is at the top and a L.P. blower emergency stop push button is in the centre.