Photos: Subway Construction Work Deep Under Manhattan

(Courtesy of Metropolitan Transportation Authority/Patrick Cashin)

NEW YORK—The Second Avenue Subway is a new line being built under Manhattan’s Upper East Side, where workers have been carving out the tunnels and station caverns for years.

Part one of the massive infrastructure project—one of the largest in the United States—is slated for completion in December 2016.

[Related: Massive Subway Caverns Under New York]

These photos show excavation work on the cavern that will one day be a brand new station, at 86th Street and Second Avenue.