The Chesapeake Bay Bridge Tunnel is an underwater tunnel in Virginia connecting Virginia Beach to Virginia's Eastern Shore.
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How long is the Channel Tunnel? 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.
Today, the longest EU-funded underwater tunnel in Europe is officially opened in Poland. The tunnel will connect the islands of Usedom and Wolin, and the city centre of Swinoujscie with the rest of the country.
Despite this, it's not as easy as this. The Channel Tunnel, in fact, has the longest underwater section, with 39 km against the 23 km of its Japanese rival. Nevertheless, the title of the world's longest still goes to the Seikan tunnel.
The Channel Tunnel (French: Tunnel sous la Manche), also known as the Chunnel, is a 50.46-kilometre (31.35 mi) underwater railway tunnel that connects Folkestone (Kent, England) with Coquelles (Pas-de-Calais, France) beneath the English Channel at the Strait of Dover.
The undersea portion of the Channel Tunnel extends below the English Channel at the Strait of Dover, and has the longest undersea segment in the world at 23 mi (39 km). Construction for the Channel Tunnel began in 1988 and ended in 1994.
As you may know, this train travels underwater for a short time. The underwater train from London to Paris goes through the Channel Tunnel, which runs under the English Channel for approximately 13 minutes.