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[quote]QUOTE: Originally posted by Old Limey The Discovery Channel I believe it was that had the Bering Straits Bridge Idea and in another 'Extreme Engineering' version a tunnel under the Atlantic was also shown. In a tube suspended and tested against Nuclear Sub Collision designed for super sonic travel. Flash Gordon and Buck Rogers will be using it all the time no doubt! Still 100 years ago Colour TV would have not been considered possible or an SR71 [/quote] I saw that 'Extreme Enginneering' on the Atlantic tunnel as well. Besides the water pressure from the outside, I seem to recall they were going to pump all the air out of the tunnel to allow faster speeds. For more conventional tunnels, imagine what would be possible if someone could invent a TBM capable of 1 mph operating 24/7 through any ground. A 2000 mile tunnel could be dug in about 3 months. Maybe it could liquify the ground using high power lasers or ultrasound? Getting materials in for the lining would seem to be a problem.
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