10 of the world's greatest tunnels

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The world's 10 most extraordinary tunnels

10 of the world's greatest tunnels

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The world's 10 most extraordinary tunnels

Tokyo Bay Aqua-Line is a tunnel underwater, 4.4km long connecting Chiba and Tokyo, it was elected as 10 of the world's greatest tunnels by CNN in 20 Stock Photo - Alamy

10 of the world's greatest tunnels