The type 81 general purpose frigate HMS Zulu (1962) in No. 1 dry dock in Rosyth Dockyard during a lengthy refit which was completed in December 1974. The photographer is standing on the floor of the dock looking forward and to port showing the aft end of the aft section of the starboard bilge keel. Cathodic anodes are fitted to the bilge keel plating. Diver's search lines are painted on the hull and circles are painted round various hull inlets and outlets.