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By digging the structure deep into the Earth, its walls and ceiling made of corrugated steel sheets had the rigidity needed to withstand relentless bomb blast
Full Transcript
00:00:01.000 --> 00:00:03.035
By digging the structure deep into the Earth,
00:00:03.035 --> 00:00:06.074
its walls and ceiling made of corrugated steel sheets
00:00:06.074 --> 00:00:10.173
had the rigidity needed to withstand relentless bomb blast.
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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.