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.

In the South China Sea, near the Paracel Islands, the aqua-colored waters of an expansive shallow reef platform suddenly ...

Over the past 15 years, around 150 divers have lost their lives visiting the Blue Hole in Egypt, with estimates suggesting ...

This amazing astronaut photo shows the bizarre whale-like shape of a Belizean tropical island. The coral-reef-covered structure is home to the Great Blue Hole, one of the deepest marine sinkholes on ...

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 ...