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An underwater tunnel is a tunnel which is partly or wholly constructed under the sea or a river. They are often used where building a bridge or operating a ferry link is unviable, or to provide competition or relief for existing bridges or ferry links. [ 1 ]
The Holland Tunnel was the first underwater tunnel designed for automobiles. Atlantic Avenue tunnels on Long Island Rail Road: Abandoned Cobble Hill Tunnel under Atlantic Avenue, Downtown Brooklyn; Current Atlantic Branch tunnels under Atlantic Avenue, Downtown Brooklyn and Queens
The 1927 Holland Tunnel was the first underwater tunnel designed for automobiles. The construction required a novel ventilation system. In 1945 the Delaware Aqueduct tunnel was completed, supplying water to New York City. At 137 km (85 mi) it is the longest tunnel in the world.
The Channel Tunnel (French: Tunnel sous la Manche), sometimes referred to by the portmanteau Chunnel, [3] [4] is a 50.46 km (31.35-mile) undersea railway tunnel, opened in 1994, that connects Folkestone (Kent, England) with Coquelles (Pas-de-Calais, France) beneath the English Channel at the Strait of Dover.
Longest underwater road tunnel in the world Water supply #6 Tunnel, Yellow River Diversion to Shanxi South Line Shanxi, China 14,400 m (8.948 mi) 2002 See South–North Water Transfer Project: Water supply Ala Mountain Pass Water Supply Project Xinjiang, China 14,346 m (8.914 mi) 2010 Road Twin Tube Ovit Tunnel [81]
The tunnel is 7,008 m (4.355 mi) long, although only 3,621 m (2.250 mi) of its length are under the river. It was the longest underwater tunnel in the world until 1987—when Japan’s Seikan Tunnel linking the islands of Honshu and Hokkaido took the title—and, for more than 100 years, it was the longest mainline railway tunnel within the UK.
The Fort Lauderdale tunnel is one of two underwater tunnels in South Florida — the PortMiami tunnel from the MacArthur Causeway to Dodge Island is the other. The namesake of the Fort Lauderdale ...
The first underwater rail tunnel in North America [4] was opened by the St. Clair Tunnel Company in 1891. The company was a subsidiary of the Grand Trunk Railway (GTR), which used the new route to connect with its subsidiary Chicago and Grand Trunk Railway, predecessor to the Grand Trunk Western Railroad (GTW).