On board the Type 12 general purpose frigate Plymouth (1959) alongside the south side of number 3 basin in Chatham Dockyard at the end of a modernization which commenced in August 1966. The ship is berthed starboard side to the quay. The photographer is the transmitting station cooling compartment between 28¼ and 30½ stations on the centreline of 2 deck looking aft and to port from close to the door showing a CO² fire extinguisher, a condenser/evaporator unit and a switch and fuse distribution panel manufactured by C & N (Electrical) Ltd of Gosport and Newbury. A vertical format negative.