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Tunnel in Turkey links Europe and Asia

A train is stationed at the Uskudar Marmaray station ahead of its inauguration ceremony in Istanbul on October 29, 2013. Turkey will unveil the world's first sea tunnel connecting two continents, fulfilling a sultan's dream 150 years ago in a three-billion-euro mega project driven by the Islamic-rooted government. The 13.6-kilometre (8.5 mile) long tunnel linking Istanbul's European and Asian sides includes an immersed tube tunnel which officials say is the world's deepest at 60 metres (nearly 200 feet) below the seabed. AFP PHOTO/OZAN KOSEOZAN KOSE/AFP/Getty Images

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    Tunnel in Turkey links Europe and Asia

Turkey has opened a new underwater railway tunnel that connects Europe and Asia. CNN's John Defterios has the story.