How it formed: Once a limestone cave during the Ice Age, it collapsed and flooded as sea levels rose, creating a perfect circular sinkhole over 400 feet deep. Life within: Home to reef sharks, vibrant ...

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 ...

Belize’s Great Blue Hole is more than just a breathtaking circle of deep blue in the Caribbean—it’s a geological time capsule, a diver’s challenge, and a living lab for scientists. Formed during the ...