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  1. Deepest blue hole in the world discovered, with hidden caves and ...

  2. Blue hole - Wikipedia

  3. Scientists flock to mysterious 'blue hole' off Florida's Gulf Coast

  4. Scientists can't find bottom of deepest hole in ocean - BBC

  5. Researchers found the planet's deepest under-ocean sinkhole — …

  6. Taam Ja': Diving the world's deepest blue hole

  7. Taam Ja' Blue Hole, The Deepest Ocean Sinkhole On Earth - All …

  8. Scientists Embark on Journey to the “Deep” to Explore Blue Holes

  9. Scientists Discover the World's Deepest Blue Hole - Popular Mechanics

  10. Explore Some of the World’s Deepest Blue Holes - Smithsonian Magazine