How deep is the tunnel under the East River?

The tubes descend 91 to 95 feet (28 to 29 m) below the mean high water level of the East River, with a maximum gradient of 3.1 percent. During the tunnel's construction, a house at 58 Joralemon Street in Brooklyn was converted into a ventilation building and emergency exit.



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Within the city, too, the tunnels are deeply buried—for instance, 500 feet below the streets of Manhattan's West Side—because it is easier to connect to the water mains with vertical risers than to go wandering around through all the complications that lie closer to the surface.

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In cooperation with Rönesans Holding, the Heitkamp Construction Swiss GmbH tunnel and railroad construction specialists constructed the world's longest and deepest tunnel, the Gotthard Base Tunnel. This 57 kilometre-long tunnel lies at a depth of 2,300 metres.

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Technically it's legal to swim in the East River, although it's also strictly forbidden to actually enter the river. Legalities aside, Mike Dulong, senior attorney for the New York water quality advocacy group Riverkeeper, claims that the East River isn't as unsanitary as the average New Yorker might assume.

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The Hudson River, which flows 301 miles from Lake Tear of the Clouds in the Adirondacks to New York Harbor, is the longest river completely in New York State. It is also the deepest, reaching depths of over 200 feet in spots.

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The Congo is the deepest river in the world. Its headwaters are in the north-east of Zambia, between Lake Tanganyika and Lake Nyasa (Malawi), 1760 metres above sea level; it flows into the Atlantic Ocean.

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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.

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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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Answer and Explanation: The deepest river in the United States is the Hudson River, which reaches 200 feet deep at some points. The St. Lawrence River, which runs through parts of the U.S., is slightly deeper with a maximum depth of 250 feet, but mostly flows along the border of the U.S. and into Canada.

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10 of the world's greatest tunnels
  • Seikan Tunnel (Japan) — ...
  • Bund Sightseeing Tunnel (China) — ...
  • Gotthard Base Tunnel (Switzerland) — ...
  • Lærdal Tunnel (Norway) — ...
  • Channel Tunnel (UK and France) — ...
  • Tokyo Bay Aqua-Line (Japan) — ...
  • Eisenhower Tunnel (Colorado) — ...
  • Spiralen tunnel (Norway) —


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The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.

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