From the Hillview reservoir water flows by gravity to three tunnels under New York City. Water rises again to the surface under natural pressure, through a number of shafts. The three tunnels are: New York City Water Tunnel No.
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The tunnel itself was completed in 2008, and after the construction of seven riser shafts was completed, this section of the tunnel opened in 2013. Two additional riser shafts, each over 700 feet (210 m) deep, are under construction in Brooklyn and Queens as of 2022.
Technically called “Tunnel Street,” the three-block-long passage is the city's only underground street, according to 6sqft. It serves as a Broadway entrance to the 191st Street subway station, which, at 175 feet underground, is the deepest in the system.
Today, underwater tunnels are often created with humongous tunnel-boring machines (TBMs) — sometimes called moles. These machines cost millions of dollars, but they can create large tunnels in a very short time. A circular plate with disk cutters rotates to cut through rock as the machine inches forward slowly.
The Brooklyn-Battery Tunnel is the longest tunnel in New York. The Brooklyn-Battery Tunnel is the longest tunnel in New York. It is a marvel of engineering, stretching an impressive 9,117 feet beneath the bustling streets of New York City.
Also known as the Cobble Hill tunnel, the half-mile Atlantic Avenue tunnel is not only the oldest subway tunnel in NYC but also the world. Running beneath Brooklyn's Atlantic Avenue, it was first built in 1844 and was sealed off in 1861.
Many of the disused subway stations and tunnels running under NYC are closed to the public for safety reasons, but there are still ways to see them. In some cases, you can catch glimpses of disused subway tunnels or subway platforms while riding past on currently operating lines.
Derinkuyu, Cappadocia, TurkeyCappadocia city, located in central Turkey, is home to no less than 36 underground cities, and at a depth of approx. 85 m, Derinkuyu is the deepest.
Construction began nearly 40 years ago and was guided through several administrations changes. Today, the tunnel runs more than 60 miles in length, spanning from the Hillview Reservoir in Yonkers, through the Bronx, Manhattan, and across the East River into Brooklyn and Queens.
Detroit-Windsor TunnelIt is the third oldest underwater vehicle tunnel in the United States or Canada. It stands behind only New York/New Jersey's Hudson River-crossing Holland Tunnel (completed in 1927) and the Posey Tube (completed in 1928), which connects Alameda and Oakland, California.
Norwegian road infrastructure operator Statens Vegvegsen has officially opened world's deepest subsea tunnel, the 14.4km Ryfylke tunnel near Stavanger. The tunnel reaches a maximum depth of 292m below sea level.
Also known as the Cobble Hill tunnel, the half-mile Atlantic Avenue tunnel is not only the oldest subway tunnel in NYC but also the world. Running beneath Brooklyn's Atlantic Avenue, it was first built in 1844 and was sealed off in 1861.