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 ...

Near the Chinese city-province of Chongqing lies a natural wonder of truly epic proportions. The Xiaozhai Tiankeng is the deepest sinkhole in the world, where even skyscrapers would disappear. But the ...

The world's deepest underwater sinkhole in the waters of Chetumal Bay between Mexico and Belize remains shrouded in mystery after researchers reported they have yet to determine its full depth.

This latest sinkhole in Chile ranks as one of the deepest in the world, according to Largest.org, which keeps track of the largest of everything in the world. The Chilean sinkhole is larger than the ...