Here's another look inside Han Soon Doong Cave, the largest known cave passage cross-section in the world, located in Phong Nha-Ke Bang National Park, Bo Trach District, Quang Binh Province, Vietnam. It was discovered by a local man named Ho Khanh in 1991. The whistling sound of wind and roar of a rushing stream in the cave heard through the entrance as well as the steep descent prevented the local people from entering the cave at first. Continue reading for another expedition video, more pictures and information.
The cave contains some of the tallest known stalagmites in the world, which are up to 70 m tall. Behind the Great Wall of Vietnam were found cave pearls the size of baseballs, an abnormally large size. The cave runs for approximately 5.6-miles and is punctuated by 2 large dolines, which are areas where the ceiling of the cave has collapsed. The dolines allow sunlight to enter sections of the cave which has resulted in the growth of trees as well as other vegetation.