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 …
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Huh? Electric cars were never a mass market product. EPB is how a decent fraction of first-world metro construction works.
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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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