A new, record-breaking blue hole has been discovered in Chetumal Bay off the coast of Mexico’s Yucatán Peninsula, plunging ...

A cave sealed behind gates was recently explored, revealing an unexpected sight deep inside. Hidden underground was a striking blue hole, its depth and origin still unclear. The restricted access has ...

Mexico's Taam Ja' Blue Hole is the deepest known underwater sinkhole in the world, researchers have discovered — and they haven't even reached the bottom yet. New measurements indicate the Taam Ja' ...

Twenty years ago, a cave diver found thousands of fossils in a blue hole on Great Abaco Island. The fossils reveal the island's Ice Age history, with pristine specimens of now-extinct species.

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 ...