1,280 feet: Norway building world's deepest, longest undersea tunnel
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113 meters: China sets record for deepest underwater high-speed rail tunnel
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How the world’s deepest undersea mega tunnel is being built
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The deepest underwater road tunnel: Norway's Rogfast
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Behold the "Dragon Hole." Scientists have discovered what's being described as the world's deepest underwater sinkhole in the South China Sea. http://cnn.it/2anA1iT | CNN
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The Longest Underwater Tunnel in the World – Lifeboat News: The Blog
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Flanked by two powerful nations, the English Channel has long been one of the world’s most important maritime passages. Yet for most of its history, crossing was a dangerous prospect. Until engineers proposed building an underwater passage: | TED-Ed
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