How to get there - Son Doong cave

Son Doong cave is world's largest cave, located in Son Trach, Bo Trach District, Quang Binh province, Vietnam. It is situated below another cave in Phong Nha-Ke Bang, though its entry passage is very difficult to traverse. The exploration team said they had set foot on just 6.5 kilometers along the cave, as there is a large amount of fast flowing water inside Son Dong. It takes explorers 6 hours of walking through a 10 kilometer long forest path from Truong Son Highway to reach the mouth of Son Dong cave.