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結果 : what is the longest underwater tunnel in the world
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How the world's longest underwater tunnel was built - Alex Gendler

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How the world’s largest underwater tunnel is being built | BBC News

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Unbelievable! The sea is full of water, how is the undersea tunnel built?

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The NEW longest underwater tunnel!

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Railway Architecture | The Longest Underwater Tunnel in the World | FD Engineering

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Who designed this underwater road? That's so talented!#viralshort #subscribe

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