So-called “blue holes” are naturally formed cavities on the sea floor with vertical walls, mostly found in coastal regions ...
Add Yahoo as a preferred source to see more of our stories on Google. An aerial view of the Taam Ja' Blue Hole. Mexico's Taam Ja' Blue Hole is the deepest known underwater sinkhole in the world, ...
Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Sinkholes are natural depressions that form when rock ...
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