Aerial photo taken on Nov. 16, 2019 shows a newly discovered giant karst sinkhole in Napo County in south China's Guangxi Zhuang Autonomous Region. (Photo provided to Xinhua)
Photo taken on Nov. 16, 2019 shows an expedition team watching karst caves inside a sinkhole in Napo County, in south China's Guangxi Zhuang Autonomous Region. (Photo provided to Xinhua).
Photo taken on Nov. 17, 2019 shows plants growing at the bottom of one karst sinkhole in Napo County, in south China's Guangxi Zhuang Autonomous Region. (Photo provided to Xinhua)
A cave expedition member prepares equipment before exploring giant karst sinkhole in Napo County, south China's Guangxi Zhuang Autonomous Region, Nov. 2, 2019.
A cave expedition member works in a cave connecting giant karst sinkhole in Napo County, south China's Guangxi Zhuang Autonomous Region, Nov. 3, 2019.
Cave expedition members rest at the bottom of a giant karst sinkhole in Napo County, south China's Guangxi Zhuang Autonomous Region, Nov. 2, 2019.
