World's deepest underwater sinkhole found in South China Sea

Sinkhole, or blue hole, at China's Xisha Islands. (Photo/Xinhua)

Chinese researchers have found the world's deepest underwater sinkhole, or blue hole, at China's Xisha Islands in the South China Sea.

The blue hole is 300.89 meters deep, surpassing the current record of 202 meters, the researchers confirmed Friday.