NOVA PBS

Creatures of the Underwater Caves

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Blue Holes
Beneath the land surface of the Bahamas, the underwater caves known as blue holes stretch for hundreds of miles in all directions. Today, these labyrinthine passages host a variety of tiny sea creatures found nowhere else on the planet. But during the last ice age when sea levels were much lower, the caves were the high-and-dry habitat for a completely different group of animals.


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