How many miles of tunnels are under NYC?

Consider just the drinking-water supply, which after 180 years of nearly constant construction flings out giant tunnels that run as deep as 1,114 feet below sea level (crossing under the Hudson River near West Point) and 2,422 feet below the surface (of the Shawangunk Mountains) to draw from reservoirs in the Catskills ...



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The New York City subway system has 16 subway tunnel connections underneath water bodies, if we're counting smaller gaps, like the Newtown Creek and Harlem River.

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Derinkuyu, Cappadocia, Turkey Cappadocia 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.

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600 Feet Under Manhattan in NYC's Underground City.

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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.

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SubTropolis is a 55,000,000-square-foot (5,100,000 m2), 1,100-acre (4.5 km2) artificial cave in the bluffs above the Missouri River in Kansas City, Missouri, United States, that is claimed to be the world's largest underground storage facility.

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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.

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The Sandhogs of New York - out of sight and underground, the many Irish immigrants who dug as deep under the Big Apple as skyscrapers are high.

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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.

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The island of Manhattan is connected to the rest of the world through 21 bridges and 15 tunnels. The bridges range in complexity from the comparatively simple Harlem River swing bridges to the grandeur of the Brooklyn Bridge and cover a hundred years of bridge construction technology and social change.

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Derinkuyu, Cappadocia, Turkey | Underground cities The lunar-like region of Turkey's Cappadocia encompasses no less than 36 underground cities, but Derinkuyu is the deepest and most impressive of all of them.

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The ancient city of Elengubu, known today as Derinkuyu, burrows more than 85m below the Earth's surface, encompassing 18 levels of tunnels.

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What is the only major U.S. city without skyscrapers? Washington D.C.

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The Queens Midtown Tunnel serves as a major connection between midtown Manhattan and Queens. On the Manhattan side is Murray Hill, an attractive residential neighborhood.

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Designed by Ole Singstad, the tunnel was built by shield-and-compressed-air methods to hold back the outside water pressure. The tunnel consists of three vehicular tubes, each of which carries two lanes of traffic. It is about 1.5 miles (2.4 km) long and lies 97 feet (30 metres) below the river's surface.

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