A joint China-UK expedition team had discovered a world-class cave hall in the Fengshan County of south China's Guangxi Zhuang Autonomous Region.
The size of the cave-hall is about 6.7 million cubic meters and the Nongle sinkhole is about 200 meters long, 100 meters wide and 118 meters deep. The bottom of the sinkhole is a huge cave due to collapses.
_Watch the video above to see the depth of the sinkhole. _