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[The World's 20 Most Amazing Tunnels]Channel Tunnel, France/United Kingdom
Stretching from Folkestone, Kent, in the United Kingdom to Coquelles near Calais in northern France, the more than 30-mile-long Channel Tunnel carries high-speed trains back and forth under the English Channel's Strait of Dover, where it reaches a depth of some 250 feet below sea level. (Mortadelo2005/Wikimedia Commons)
2013. 5. 9. 14:37
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