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Old Posted May 13, 2019, 11:30 PM
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The Chemist The Chemist is offline
Join Date: Aug 2001
Location: 中国上海/Shanghai
Posts: 8,883
Originally Posted by bobdreamz View Post
In Miami's case they had to elevate the Metrorail system because the entire metro sits on the Biscayne aquifer which is composed of porous limestone.
You dig a few feet down and you hit water.
It didn't turn out too bad :

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If Shanghai can build the world's largest Metro system, a large percentage of which is underground, in the soft mud of the Yangtze River delta, I don't know if I buy the idea that you wouldn't be able to build underground in Miami.
"Nothing is too wonderful to be true, if it be consistent with the laws of nature." - Michael Faraday (1791-1867)
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