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Title:DEFENCE IN DEPTH (short version) [Main Title]
Film Number:ADM 2139
Other titles:
Summary: Documentary about the laying and sweeping of mines; also covers divers in training. Ships featured include HMS Stubbington, HMS Bronington, HMS Galatea and HMS Aurora; Westland Wasp and Westland Wessex helicopters are used, and an anti-submarine mortar is shown.