10 Unsettling Things About the Ocean That Still Puzzle Us

5. The Ocean's Blue Holes
Blue holes are giant marine sinkholes that plunge hundreds of feet into the ocean floor. Famous examples include the Great Blue Hole in Belize and the Dragon Hole in the South China Sea. These underwater caves and vertical shafts are biodiversity hotspots that remain largely unexplored due to their depth and the technical challenges of diving into them.
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