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News channel or source: https://www.nationalgeographic.com/magazine/article/bahamas-caves-underwater-blue-holes
Published on: Saturday 31 July 2010
Veteran cave diver Brian Kakuk lifts a more than 3,000-year-old Cuban crocodile skull—an animal no longer found in the Bahamas—from sediment in Sawmill Sink. Nearly oxygen free, blue holes preserve ...