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A comment on Why New York City Stopped Building Subways. Parent comment

Re:Why New York City Stopped Building Subways by Animats on Monday April 16, 2018 @10:48PM (#16855039)
Deeper is possible, but expensive. See NYC Water Tunnel #3.[1] Under construction since 1970. Several sections already in use; completion 2020. As deep as 800 feet down, 24 feet in diameter.

[1] https://en.wikipedia.org/wiki/New_York_City_Water_Tunnel_No....

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