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Re:For $1B, Elon Musk’s Tunnel to O’Hare Would Be a Miracle by jandrese on Friday June 15, 2018 @04:30PM (#17323287)
Two things. 1 is that they're planning to use a lot of cut and cover which is a lot cheaper but more disruptive. 2 is that the project isn't complete yet so those final cost figures are still fiction.
Re:For $1B, Elon Musk’s Tunnel to O’Hare Would Be a Miracle by rohit2412 on Saturday June 16, 2018 @10:01AM (#17327430)
No, only the stations are cut and cover. They have ordered 17 tbm for the tunnels.

About the cost estimate, I don't have any other completely underground metro line in a developing country to compare. But Is it the labor costs in developed countries?