On board the County class guided missile destroyer London (1961) alongside the fitting out berth at the Neptune Works of Swan, Hunter & Wigham Richardson Ltd at Wallsend-on-Tyne. The ship is berthed starboard side to the quay. The photographer is looking down and to starboard into the hull outfit 19 (asdic type 176) trunk between 23 and 29 stations on 4 and 5 decks from 3 deck showing the motor for rotating the asdic head, the relative bearing ring and the rotatable shaft. A spare dome cover is mounted against the starboard bulkhead.