“To keep the soft ground from collapsing, engineers snaked coils of coolant through the soil to form a protective arch of frozen earth. That let crews work safely while traffic rumbled overhead. Cost: $1 million per foot.” WHAT?????

How Engineers Are Building a New Railroad Under New York City | Autopia | Wired.com

The biggest public transit infrastructure effort in the US is almost completely invisible — unless you’re 160 feet underground.

http://www.wired.com/autopia/2013/05/fa_tunnel/

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