How long is the longest underwater tunnel in the world?

The Seikan Tunnel (Japanese: ??????, Seikan Tonneru or ????, Seikan Zuido) is a 53.85 km (33.46 mi) dual-gauge railway tunnel in Japan, with a 23.3 km (14.5 mi) portion under the seabed of the Tsugaru Strait, which separates Aomori Prefecture on the main Japanese island of Honshu from the northern island of Hokkaido.



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“The first infrastructures of this type were built at the end of the 19th century, and at present there are nearly 200 underwater tunnels built worldwide. Although some are used for water and electricity supply, most are used to house road or rail connections.

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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 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 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.

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There are even tunnels designed as wildlife crossings for European badgers and other endangered species. The longest tunnel in the United Kingdom is the Northern line at 27,800 metres (91,200 ft).

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1. -The Laerdal tunnel. With its 24.5 kilometers, Laerdal tunnel is the longest in the world, traversing several mountainous formations between Laerdal and Aurland, in western Norway.

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The Channel Tunnel opened in May 1994 after six years of construction and is the longest undersea tunnel in the world. It actually consists of three tunnels running parallel to each other; the two outer tunnels are used for trains and the smaller central service tunnel is used for ventilation and access.

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The tunnel is actually designed to leak. As Eurotunnel explain on their website, 'seawater from the rocks above the tunnel drips through and is then pumped away.

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Fritchley Tunnel is a disused railway tunnel at Fritchley in Derbyshire, England, which is believed to be the oldest surviving example in the world. The tunnel was constructed in 1793 by Benjamin Outram as part of the Butterley Gangroad, altered in the 1840s, and remained in use until the railway closed in 1933.

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