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So initially, I think they were built by wall engineers who were highly skilled and they're quite sophisticated, but over time they needed to build more and more
Full Transcript
00:00:01.000 --> 00:00:03.084
So initially, I think they were built by wall engineers
00:00:03.084 --> 00:00:06.087
who were highly skilled and they're quite sophisticated,
00:00:06.087 --> 00:00:09.031
but over time they needed to build more and more.
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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.