A team of cave explorers has uncovered a hidden forest deep inside a massive sinkhole in southern China. More than 600 feet below the surface, a dense and towering ecosystem had been quietly evolving ...

They can be a life-threatening disaster—or a pricey nuisance. Here’s what you need to know about the depressions and holes ...

Using the VideoRay Pro 4, an underwater robot carrying a depth sensor, Chinese researchers at the Sansha Ship Course Research Institute for Coral Protection, found out that the blue hole is 300.89 ...