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  1. Mysterious tunnel leads divers over 6,000 foot abyss

    Mysterious tunnel leads divers over 6,000 foot abyss

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  2. Mysterious ocean tunnel leads to 4 mile deep drop off

    Mysterious ocean tunnel leads to 4 mile deep drop off

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  3. Scuba diver faces huge barracuda in tunnel entrance

    Scuba diver faces huge barracuda in tunnel entrance

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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. Belize's Great Blue Hole is mysterious and thrilling

    Belize's Great Blue Hole is mysterious and thrilling

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