Metro

Dig it! 7 subway-extension tunnels finished

The mezzanine

The mezzanine

Here’s another miracle on 34th Street — or, at least, under it.

As these pictures show, the MTA has finished all of the tunneling for the 7-train extension to 11th Avenue and completed carving out the mezzanine — a complex job that paves the way for train operation by 2013.

The future 34th Street station’s mezzanine is all but finished and features a soaring, curved roof with a 1,200-foot-long cavern — about the size of the Empire State Building if it were laid on its side.

The station will certainly need the space.

City Hall estimates that 35,000 passengers a day will use the station by 2030, when the area is expected to be a bustling neighborhood with skyscrapers and stores lured in by the new subway.

The city is so confident the one-stop addition to the 7 will revive the desolate area that it has agreed to fork over the $2.1 billion to pay for it.

Trains are expected to be in operation by December 2013.

Construction snafus could move the grand opening to early 2014.

It hasn’t been an easy feat bringing the 7 west.

Boring machines dug two tunnels deep underground, beginning at 42nd Street.

Because of existing infrastructure — like the Lincoln Tunnel and old railroad lines — those tunnels had to be dug extra deep and are steeply curved in spots.

Workers also had to make sure to avoid the Eighth Avenue subway line, as well as Amtrak and NJ Transit.

The westward expansion also cuts through the famous abandoned E-train platform at 42nd Street, which was featured in the movie “Ghost.”

Unfortunately, straphangers hoping for a glimpse of Patrick Swayze’s old stomping grounds are out of luck.

Although parts of the platform survived the 7-line work, they won’t be visible from the trains.