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The concrete slab was inserted between the basement ceiling and the ground floor
Full Transcript
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The concrete slab was inserted
00:00:03.031 --> 00:00:06.065
between the basement ceiling and the ground floor.
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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.