As @alon_levy has pointed out many times, Spain and Korea (among others) have already figured out how to tunnel for an order of magnitude cheaper than the US pays. We don’t need @elonmusk to reinvent the earth pressure balance machinehttps://twitter.com/elonmusk/status/943882440984223747 …
Exactly the point. Tunnels are not a mass market product. And did you notice that the US lost the ability to build viable subways ca. 1950? A mile of new US subway now costs upwards of a Billion!
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Tunnels are a mass market product this side of the Atlantic, but Musk is ignorant of advances here and of what drives high costs in the US.
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I have to admit that I am personally absolutely clueless wrt the economics an technology of tunneling, so my opinion is worthless. I just have the intuition that Elon Musk is smart and capable enough to buy and create more cognition on it than Spain.
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