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' ...

There is nothing reassuring about a cave with a name like Hell Hole, and even less comfort in the fact that its doorway is now protected by a steel-and-concrete structure called the “Mailbox,” an ...

Researchers have found a blue hole they say is the deepest in the world—and they’ve yet to find where it bottoms out. The formation is the Taam Ja’ Blue Hole in Mexico’s Chetumal Bay, and it has so ...

Spider Hole Cave, also known as Northbend Sink, is a vertical cave where the ground opens into darkness with little warning. The descent leads into a cold, confined underground environment shaped by ...

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.