The channel Tunnel, or Chunnel, is a 51.5km (31 miles) long rail tunnel beneath the English Channel at the Straits of Dover, connecting Folkestone, Kent in England to Coquilles near Calais in Northern France. The idea of a road tunnel between England and France was first suggested to Napoleon in 1802. It was not until nearly two centuries later that the dream became reality.
The $15 billion link, one of Europe’s biggest infrastructure projects up to date, was officially opened by President Mitterrand of France and HRH Queen Elizabeth II of England, in 1994. The Channel Tunnel is the second-longest rail tunnel in the world, with the Seikan Tunnel in Japan being longer, but the undersea section of 39 km (24 miles) is the longest undersea tunnel in the world.
The tunnel consists of 3 interconnected tubes: 1 rail track each way plus 1 service tunnel. Its length is 31 miles, of which 23 miles are underwater. Its average depth is 150 feet under the seabed
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