The Huge Mist Cannons That Keep the Air Clean in NYC's New Tunnels

We've followed the $10.8 billion East Side Access project, which will extend the Long Island Railroad from Queens to Grand Central, all year. But now that the tunnels have been blasted, new machines are arriving—and they're just as cool as the tunnel borers. » 3/20/14 2:00pm 3/20/14 2:00pm

How the Persian Gulf Is Quietly Building a Railroad Empire

Here in the U.S., the arrival of a new tunnel boring machine is huge news, warranting naming ceremonies and Twitter accounts. Meanwhile, in Doha, officials have quietly signed a contract to buy fifteen boring machines to build a sprawling new subway system. And that's nothing compared to the massive transit network… » 3/17/14 10:00am 3/17/14 10:00am

London's Newest Farm Is an Abandoned Bomb Shelter Deep Beneath the City

What do you do with a bomb shelter when you're no longer getting Blitzed by the Nazis? For decades, Londoners have searched for ways to make use of old bomb shelters lurking deep underground. They've become data centers, dusty storage rooms, and, now, the first underground urban farm—thanks to a couple of foodie… » 2/04/14 11:00am 2/04/14 11:00am

8 Massive Tunnels Being Built Right Now Under A City Near You

Now that we know it was an eight-inch steel pipe that brought the world's largest-diameter tunneling machine to a halt up in Seattle, we can no longer fantasize about Bertha unearthing a five-story-tall buried locomotive. But we can look at something almost as fascinating: The other giant holes that are currently being … » 1/07/14 9:20am 1/07/14 9:20am

The Colossal Railway That's Quietly Taking Shape 160 Feet Below NYC

Maybe we can't build the world's deepest undersea tunnel in seven years like some cities, but New York still has some serious mega-construction chops. Behold: The latest photos from 120 to 160 feet below Grand Central Station, where workers are building the largest public transportation project in the US. » 11/06/13 11:00am 11/06/13 11:00am

NYC's First Inflatable Tunnel Plug Will Stop Floods, Smoke, and Gas

After Hurricane Sandy decimated the subway system last year, officials pledged to install new devices to help halt the rising tides—including flood gates and, more intriguingly, a device called a "tunnel plug." » 11/04/13 4:00pm 11/04/13 4:00pm

Why the Biggest Obstacle for Elon Musk's Hyperloop Might Be Tunnels

It all sounds so Jetsonian. A new 600 mph "Hyperloop" method of transportation connecting Los Angeles and San Francisco? That's the buzz around the internet water cooler as people guess what Elon Musk has in store for the transportation of tomorrow. I say, sign me up! But if we take any lessons from past visions of… » 7/19/13 12:55pm 7/19/13 12:55pm

Incredible Images of the Massive New Tunnels Hollowing New York City

There is a 22-foot-long, 200-ton steel monster under Manhattan. Dead, resting deep somewhere under Grand Central Station and Park Avenue, this machine and her twin brother excavated the massive tunnels that you can see here, one of the largest public transportation works of our time. » 2/21/13 12:00pm 2/21/13 12:00pm