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 in the mortar metadyne room between 65 and 67 stations on the centreline of 3 deck looking aft from the door showing a bench with an electronic unit under repair. Against the aft bulkhead are two junction boxes with the covers removed. A vertical format negative.