Far out in the South China Sea, a massive underwater sinkhole plungesnearly 1,000 feet straight down. It’s called the Dragon Hole, and it’s a strange, silent world where oxygen vanishes and sunlight ...

I spent years preparing to dive into the deepest place on Earth. Only a handful of people have traveled into the depths of the Mariana Trench, nearly 7 miles below the ocean surface. As a geologist ...

There’s an underwater sinkhole off the coast of Belize that is so deep, scientists aren’t sure how far down it goes. In Chetumal Bay, sinkhole Taam ja’, a ‘blue hole’, has proved to be a challenge for ...