Climbers were studying a sinkhole when they realized one of the largest cave halls in the world was beneath them.
원문출처 : https://www.cnn.com/videos/travel/2018/10/23/cave-discovered-in-china-under-sinkhole-orig-qc.cnn
원문출처 : https://www.cnn.com/videos/travel/2018/10/23/cave-discovered-in-china-under-sinkhole-orig-qc.cnn