What is the longest underwater tunnel in North America?

Although it passes just offshore of Governors Island, the tunnel does not provide vehicular access to the island. With a length of 9,117 feet (2,779 m), it is the longest continuous underwater vehicular tunnel in North America. Plans for the Brooklyn–Battery Tunnel date back to the 1920s.



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The Ted Williams Tunnel interface in East Boston between the land-based approach and the underwater section is 90 feet below the surface of Boston Harbor, the deepest such connection in North America.

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The Twin Bores 15, 1968, and was completed five years later on Mar. 8, 1973. The Eisenhower Tunnel celebrates a big milestone of Connecting Colorado for 50 Years as of March 8, 2023. This bore was originally called the Straight Creek Tunnel, and later was officially named the Eisenhower Memorial Bore.

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World's longest railway tunnel, Gotthard Base Tunnel, Switzerland.

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The Channel Tunnel (often called the 'Chunnel' for short) is an undersea tunnel linking southern England and northern France. It is operated by the company Getlink, who also run a railway shuttle (Le Shuttle) between Folkestone and Calais, carrying passengers in cars, vans and other vehicles.

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The Channel Tunnel or Chunnel is a 50km-long undersea rail tunnel below the Strait of Dover in the English Channel. It is one of the longest underwater tunnels in the world and connects Folkestone in Kent, UK, with Coquelles in Pas-de-Calais, France.

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In terms of underwater tunnels in general, though, the top honor goes to the Channel Tunnel, which connects England and France by rail. Its submerged portion runs for 37.9 kilometers, the longest of any underwater tunnel in the world.

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The first tunnel built whose engineer is known was excavated in the island of Samos. The engineer Eupalinos de Megara, built this tunnel in the 530 b.C to supply with water the capital of the island and was, with its 1 km length, considered as one of the three marvels of the helenic world.

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The Channel Tunnel is 31.5 miles long or 50.45 km. That's the equivalent of 169 Eiffel Towers stacked on top of each other. 23.5 miles (37.9 km) of the Channel Tunnel is under the English Channel, making it the world's longest undersea tunnel.

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The longest tunnel in the United Kingdom is the Northern line at 27,800 metres (91,200 ft). This will be superseded in the 2020s by the 37,600-metre (123,400 ft) Woodsmith Mine Tunnel in North Yorkshire that will transport polyhalite from North Yorkshire to a port on Teesside.

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