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 type 778 medium/deep transducer in the port side of the hull forward.

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 to starboard and up showing the type 778 medium/deep transdicer panel in the hull forward. A man in white overalls is holding a three feet scale stick under the transducer. Diver's search lines are painted on the hull.