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A comment on Elon Musk's first LA tunnel with free rides to kick off this summer. Parent comment

Re:Elon Musk's first LA tunnel with free rides to kick off t... by rohit2412 on Friday May 11, 2018 @07:34PM (#17051472)
And tunneling doesn't cost 1 billion dollar a mile. One Mumbai metro line is being built at 100 million dollar per km, the cost includes everything, stations, tracks, coaches, etc. And they're using 17 tbm for this purpose.
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Re:Elon Musk's first LA tunnel with free rides to kick off t... by astrodust on Monday May 14, 2018 @03:47PM (#17068823)
The cost is proportional to what kind of environment you're operating in. If it's ideal terrain it'll be cheap. If it's difficult, ever changing conditions with a high risk of subsidence damage to the structures above, get ready to pay way, way more.

See the Seattle "Big Dig" project for an example of how sideways things can go if you hit an unexpected snag.

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