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Summary: Unedited scenes of Asdic Type 177 and its use on various ships.
Description: I. Asdic. Interior MS across Asdic Control Room of anti-submarine frigate, looking towards Type 170 set. CU of asdic Type 177 and operators.
II. Asdic. MSs of hull of a frigate in dry dock, showing Type 170 and 177 asdic domes - a group of officers inspect them. CUs of Type 177 transducers with the asdic fairing removed.
III. HMS Undaunted (F.53). MSs of Undaunted in dry dock - workmen cross over a prefabricated bridge spanning the gap between the side of the basin and her upper decks - HMS Armada (D.14) alongside in the background. Sequence showing Undaunted at dusk, steaming in a smooth sea.
IV. MS to starboard bow of Colossus Class aircraft carrier secured alongside - camera pans left to frame island.
V. MS of HMS Ulster (F.83) as she leaves harbour, passing right to left across the screen. The crew are fell in for leaving port.