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The Deadly Waves/Still Secret
This is the VHS release (see more).
SummaryThis 1988 documentary, part of The Secret War series, contains two parts. The Deadly Waves shows the dismantling of a German magnetic mine by Allied officers. Still Secret details how the British cracked the Enigma code.
Get Deadly Waves/Still Secret, The now at amazon.co.uk (£ 13.99)