A 2¼ square film negative. The Type 12 frigate Yarmouth (1959) in No. 2 dry dock in Rosyth Dockyard. A very close view of the internal arrangements at the aft end of Hull Outfit 15 Type 170B sonar transducer and fairing after the covering dome has been removed. The photographer is on the floor of the dock under the keel looking aft and up into the unit. A seaman from HMS Cochrane and two dockyard mateys are on the right.