A roll film negative. On board the submarine Sealion (1959) towards the end of a long refit at Portsmouth. The photographer is in the motor room between 92 and 103 stations on the main flat looking to port from the starboard side of the walkway at 96 station showing an auxiliary propulsion control panel with an auxiliary propulsion speed regulator above it, both manufactured by The English Electric Co Ltd. Under these units is a label reading 'MK. 7 T.P. Manufactured 1973 Serial No. 034 Weight 335 lbs'. An automatic emergency lantern is on the right. A vertical format negative.