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How was the English Channel tunnel built?

April 26, 2017built channel English tunnel

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How was the English Channel tunnel built?

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They started a special tunnel digging machine from each end. The two machines met in time to join the two bores into one tunnel. One of the digging machines was dismantled and removed from the tunnel, while the other one was turned so that it dug straight down from the tunnel. They just allowed the machine to bury itself and they built the tunnel over its final resting place.