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Unlike many castles, Caerphilly's moat couldn't easily be drained, so tunneling under its walls was impossible
Full Transcript
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Unlike many castles,
00:00:02.561 --> 00:00:05.265
Caerphilly's moat couldn't easily be drained,
00:00:05.265 --> 00:00:09.112
so tunneling under its walls was impossible.
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Movie Summary
A fascinating look at how modern day structures and engineering technologies have been inspired by ancient discoveries.