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But just how were these crumbling structures meant to operate?
Full Transcript
00:00:01.000 --> 00:00:04.003
But just how were these crumbling structures
00:00:04.003 --> 00:00:05.045
meant to operate?
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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.