Shenying Tiankeng, or the bottomless pit, is a giant karst sinkhole discovered by scientific researchers in May, increasing the total number of sinkholes in south China's Leye County to 30. China Media Group and the Institute of Karst Geology of China Geological Survey organized a joint scientific research team to explore the sinkhole. The scientific research activity started on Monday and lasted about one week. | CGTN

5.9K views · 639 reactions | Follow the drone to explore the beauty inside karst caves in Bijie, southwest China's #Guizhou Province | People's Daily, China | Facebook

4.4K views · 116 reactions | CAVES AND KARST -- The world underground is home to some interesting formations and creatures. AskMDC provides more details about these natural wonders tucked beneath the earth’s surface. | Missouri Dept. of Conservation | Facebook