What is the longest underwater tunnel in Europe?

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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With its 57 km, the Gotthard base tunnel is the longest railway tunnel in the world, and the core of the new transalpine railway axis AlpTransit. The twin single track high speed rail tunnels run between Erstfeld and Bodio in Switzerland.

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What does the Eurotunnel look like underwater? This may be a disappointing answer, but you can't actually see the sea from the Eurostar. When you go through the tunnel and look out of the window, all you can see is your reflection in the glass because it's quite dark outside.

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It is 50.5km long and comprises an undersea section of 38km, still the longest in the world.

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The Fehmarnbelt Tunnel will be the longest combined rail and road tunnel anywhere in the world when it is completed in 2029. This €10 billion project - which crosses a stretch of the Baltic Sea known as the Fehmarn Belt - will connect Rødbyhavn on the Danish island of Lolland and Puttgarden in northern Germany.

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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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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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The Apennine Base Tunnel, alternatively known as the Grand Apennine Tunnel, is a railway base tunnel 18.507 kilometres (11.500 mi) long on the Bologna-Florence Direttissima line in central Italy.

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The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.

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Norway, which is considered the world's leader in tunnelling, has a whopping 900 tunnels, including the world's longest road tunnel.

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Norwegian road infrastructure operator Statens Vegvegsen has officially opened world's deepest subsea tunnel, the 14.4km Ryfylke tunnel near Stavanger. The tunnel reaches a maximum depth of 292m below sea level.

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The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.

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tunnel project, set to become the longest rail tunnel in the world.

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The Marmaray Tunnel (Turkish: Marmaray Tüneli) is a 13.5 km (8.4 mi) long undersea railway tunnel in Istanbul, Turkey, beneath the Bosporus strait, linking Kazliçesme, Zeytinburnu in Europe with Ayrilikçesmesi in Asia.

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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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Can you go to the toilet in the Eurotunnel? Unfortunately, we are unable to guarantee access to toilet facilities on the shuttles.

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At its deepest point there is 75 metres of sea water above the tunnel. Managing water pressure was a key concern for the project engineers. 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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