1. Diver Squeezes Through Underwater Tunnel

    Diver Squeezes Through Underwater Tunnel

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  2. Curious Cat Explores Underwater Tunnel Aquarium

    Curious Cat Explores Underwater Tunnel Aquarium

    6
  3. Diver risks one-breath swim through deep underwater tunnel

    Diver risks one-breath swim through deep underwater tunnel

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  4. Floating underwater tunnels: Norway earmarks $25bn for floating submerged tunnel plan - TomoNews

    Floating underwater tunnels: Norway earmarks $25bn for floating submerged tunnel plan - TomoNews

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  5. Hole in Rocks by the Sea Turns into Underwater Tunnel

    Hole in Rocks by the Sea Turns into Underwater Tunnel

    50
    13
    228
    3
  6. Palm Jumeirah Tunnel underwater

    Palm Jumeirah Tunnel underwater

    2
    0
    27
  7. Russian, Chinese Businessmen Considering Secret Underwater Tunnel Connecting to Crimea

    Russian, Chinese Businessmen Considering Secret Underwater Tunnel Connecting to Crimea

    18
  8. Hong Kong's $11BN Underwater Railway Explained

    Hong Kong's $11BN Underwater Railway Explained

    2
  9. A family of three walks hand in hand through an underwater tunnel at an aquarium

    A family of three walks hand in hand through an underwater tunnel at an aquarium

    4
  10. Germany_s _10 Billion Underwater Tunnel to Denmark

    Germany_s _10 Billion Underwater Tunnel to Denmark

    4
  11. Tunnel Fills With Smoke After Serious Accident

    Tunnel Fills With Smoke After Serious Accident

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    1
  12. Bangladesh set to open first under-river tunnel project built with Chinese funding and contractors

    Bangladesh set to open first under-river tunnel project built with Chinese funding and contractors

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

    World China's BIGGEST UNDERWATER Tunnel Is FINALLY OPEN!

    2
  14. 🚇 "The Amazing Channel Tunnel: Engineering Beneath the Waves" 🌊

    🚇 "The Amazing Channel Tunnel: Engineering Beneath the Waves" 🌊

    1
  15. Mysterious underwater tunnels at Bloody Bay Wall, Cayman Islands

    Mysterious underwater tunnels at Bloody Bay Wall, Cayman Islands

    803
  16. Underwater tunnel railways

    Underwater tunnel railways

    4
  17. Lady Free-Dives Into Underwater Tunnel

    Lady Free-Dives Into Underwater Tunnel

  18. The Chinese bridge-tunnel set 10 world records

    The Chinese bridge-tunnel set 10 world records

    80
  19. Swimming Through an Underwater Cave

    Swimming Through an Underwater Cave

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    904
  20. New battery technology, Underwater High-Speed Rail Tunnel

    New battery technology, Underwater High-Speed Rail Tunnel

    3
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    77