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And it's got steel reinforcing inside it to make it even stronger
Full Transcript
00:00:01.000 --> 00:00:03.349
And it's got steel reinforcing inside it
00:00:03.349 --> 00:00:05.041
to make it even stronger.
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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.