Thanks to discoveries made during a recent expedition in Vietnam, it appears the world's largest cave, Son Doong, is even bigger than previously thought.
원문출처 : https://www.cnn.com/travel/article/son-doong-cave-vietnam-expedition/index.html
원문출처 : https://www.cnn.com/travel/article/son-doong-cave-vietnam-expedition/index.html