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I never said it's impossible, I think it's a much bigger problem than building a machine to build the tunnel walls.



How is it a bigger problem if it has already been solved today?

The original paper attempts to deal with all of these problems, pressure, safety, land rights, it's a very interesting read.


First of all, it hasn't been solved in the US, and not for these speeds, which are at least double of the fastest bullet train in the world.




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