Deep beneath the Upper East Side, workers are digging out what will become the stations of the Second Avenue Subway.
The MTA on Monday released dramatic new pictures showing the progress of the megaproject, including this glimpse of the future 86th Street station.
Workers have excavated about 65 percent of the site.
At the future 96th Street station, crews this week are finishing the main site contract work — including excavation, relocating gas and water pipes, and putting in concrete walls to hold the structure together.
“It’s a major milestone,” said MTA spokesman Kevin Ortiz.
Workers are also building a mezzanine at the station, which is part of a separate contract.
The MTA has so far received almost a third of the rails for the Second Avenue Subway, which it is storing in the 96th Street station’s caverns.
Construction began in 2007.
The two stations, as well as one at 72nd Street, are scheduled to open in December 2016.
A new entrance at the existing 63rd Street station is scheduled to open and will connect the Second Avenue Subway with the Lexington Avenue line.