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They were first rolled out in 1939 to protect civilians most at risk from aerial bombardment
Full Transcript
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They were first rolled out in 1939
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to protect civilians most at risk from aerial bombardment.
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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.