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

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

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  4. Mysterious underwater tunnels at Bloody Bay Wall, Cayman Islands

    Mysterious underwater tunnels at Bloody Bay Wall, Cayman Islands

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  5. Cave diving the world's largest underwater cave system

    Cave diving the world's largest underwater cave system

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  7. World China's BIGGEST UNDERWATER Tunnel Is FINALLY OPEN!

    World China's BIGGEST UNDERWATER Tunnel Is FINALLY OPEN!

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  10. The Chinese bridge-tunnel set 10 world records

    The Chinese bridge-tunnel set 10 world records

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  11. $75BN Preposterous Megaprojects: Germany

    $75BN Preposterous Megaprojects: Germany

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  13. TOP 10 BEAUTIFUL NATURAL WONDERS THAT NO LONGER EXIST

    TOP 10 BEAUTIFUL NATURAL WONDERS THAT NO LONGER EXIST

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  15. Defend Yourself & Face Charges, or Surrender & Get Meat Cleaver-ed | The Dilemma of City Living

    Defend Yourself & Face Charges, or Surrender & Get Meat Cleaver-ed | The Dilemma of City Living

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  16. Modern Wonders of the World | Ancient World

    Modern Wonders of the World | Ancient World

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  18. Camera hidden at beaver lodge records incredible unknown footage

    Camera hidden at beaver lodge records incredible unknown footage

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  19. Rescuers hunting for missing Michael Mosley are now searching dangerous cave called 'The Abyss'

    Rescuers hunting for missing Michael Mosley are now searching dangerous cave called 'The Abyss'

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