Summary: A naval instructional film explaining in general terms the layout and operation of the Type 144 Asdic set.
Description: The Type 144 represents a major advance in Asdic progress as, unlike previous equipment, it plots bearing as well as range. The layout of the equipment is explained and the audience is taken through attack procedure. The film shows only the instruments - there is no intercutting of action footage, except at the end, when a hedgehog depth-bomb discharger is seen to fire upon command from the Asdic.
