Quote:
Originally Posted by ardecila
Supposedly the reason for that high cost is because they are making a decision NOT to use the tunnel segments already dug, and instead to dig a deep-level tunnel below them including cavern stations mined out of the earth. Not sure why they are intentionally throwing away the existing tunnels, but possibly because the current route turns west under 125th St (which was not contemplated in the 70s) and the tunnel now needs to pass deep below the 2-level Lexington Ave Line.
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Aha, I had not heard this. The MTA had always claimed they could use the existing tunnels from 40 years ago, but I guess it makes sense because the first phase of SAS is already extremely deep, and the alignment around 125th Street is a bit different than in past plans.