How the world's longest underwater tunnel was built - Alex Gendler
5:38
YouTubeTED-Ed
How the world's longest underwater tunnel was built - Alex Gendler
Discover how the English Channel Tunnel was built and the engineering challenges of building a 200 kilometer long tunnel underwater. -- Flanked by two powerful nations, the English Channel has long been one of the world’s most important maritime passages. Yet for most of its history, crossing was a dangerous prospect. Engineers proposed ...
4M viewsMar 30, 2020
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