How to Hurtle Through Rock at High Speeds

My new piece on Cafe takes us below ground and back in time to learn about the geology of subway construction in New York City. I focus on New York’s most notorious public transit line, the Second Avenue Subway—a project that has been ongoing for almost a century now. Learn about the Manhattan Schist, a construction nightmare called bull’s liver and a 485-ton, 450-foot-long tunnel boring machine named Adi.

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