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So canals and rivers and railways, for example, and then they would be supplemented by man-made obstacles
Full Transcript
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So canals and rivers and railways, for example,
00:00:03.047 --> 00:00:06.443
and then they would be supplemented by man-made obstacles.
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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.