63rd And Lexington The tunnel at the 63rd Street and Lexington Avenue station is being expanded to run trains from the planned Second Avenue Subway. Metropolitan Transportation Authority/Patrick Cashin
Newly released photos let you see underground construction in progress.
New York City's Second Avenue subway line was the greatest project the city never built -- until 2007, almost 90 years after its initial proposal, when the city finally broke ground on it. When completed, the $4.45 billion project will provide New Yorkers with two more miles of commutable subway tunnels on Manhattan's East Side.
Photos released on the MTA's Flickr page show a few pieces of the new route in-progress--and just how hard it is to dig a miles-long tunnel under a densely-populated island city.
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