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I like this discussion on cost, terrorism tunnel etc. while simple mecanic show that this project is unrealistic.
Distance NY to London 3475 miles. In 56 minutes you cross only 2333 miles at 2500m/h
To reach the speed of 2500 m/h in 2 minutes, the acceleration should be in the range of 1117m/s??, that is 113 times the earth acceleration. Who can stand that acceleration?
Form me this project is totaly unrealistic and it is good fun to read the discussions.
Jacques