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(gentle music) Chislehurst Caves is an old chalk mine, a labyrinth of man-made tunnels
Full Transcript
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(gentle music)
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Chislehurst Caves is an old chalk mine,
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a labyrinth of man-made tunnels.
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Movie Summary
During World War II, the British built or reinforced a series of structures consisting of over 26,000 buildings to form a line of defence against an expected German invasion. Rob Bell travels around the UK to learn their secrets.