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We recently received a “Christmas gift” of photographs from an anonymous group of urban explorers who had recently made it into the Second Avenue Subway construction. At Untapped Cities, we’ve been going down into the subway construction (legally) and photographing the progress since 2011. You can track how the subway tunnels looked at 96th Street as Phase One construction ended in 2011, the new connection being built at 63rd Street and Lexington Avenue in 2012, into “The Thunderdome” below 86th Street in 2013 and the latest progress this May. According one of the photographers in this anonymous group, “It was an amazing experience seeing the tunnels in its raw form & a once in a life time experience being able to see it.” Read on for more photos:

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Check out more photos from our last official visit to the Second Avenue subway in May and check out the art that will be included in the new subway line. Read our full coverage of Second Avenue Subway here.