What makes the Channel tunnel unique?

The Channel Tunnel is the longest undersea tunnel in the world: its section under the sea is 38km long. It is actually composed of three tunnels, each 50km long, bored at an average 40m below the sea bed. They link Folkestone (Kent) to Coquelles (Pas-de-Calais).



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The tunnel does leak, but it is designed to. Seawater from the rocks above the tunnel drips through and is then pumped away.

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From the customers' point of view, however, the project has been a great success in that the Tunnel effectively broke the ferry operators' cartel that had been operating for decades on the cross-Channel routes and led to significant price reductions. For investors, the project has been disastrous.

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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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13 hours. This was the reported duration of a sponsored walk through the service bore of the channel tunnel in the last century.

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The tunnel runs under the English Channel, but does not run “underwater”. It was dug through a layer of clay with waterproof layers both above it and below it.

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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 Channel Tunnel is under the English Channel for 37.9 km or 23.5 miles, which is the worlds longest undersea tunnel. When riding the Eurostar you'll be underwater for about 13 minutes.

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The alignment of a tunnel constructed from two ends and meeting somewhere is the middle is achieved via old fashioned surveying methods. If the tunnel breaks through to the surface, surveying stations are accurately established on the surface of the Earth at each end of the tunnel.

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Hazardous Articles include but are not limited to fireworks, firearms, explosives and weapons of any kind. 3.1 The Carriage of Hazardous Articles is subject to prohibitions and restrictions. 3.1. 2 Firearms: the Carriage of Firearms is RESTRICTED.

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