
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.