In the winter of 2018, a crew from Aquatica Submarines started their descent to the bottom of the ... and the cave flooded and collapsed, leaving behind the Blue Hole we see today.
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‘Blue hole’ is largest ever discovered at 1.3K feet deep — and scientists haven’t reached the bottom yetaka the Dragon Hole, in the South China Sea, which measures 990 feet to the bottom. Known in scientific circles as Karst formations, blue holes are actually vertical marine caves that were carved ...
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