Conquer the giant sinkhole Kong

Phong Nha – Ke Bang National Park in Quang Binh province has been recognized by UNESCO as a World Natural Heritage with a very convincing criterion: it is a typical area for the history of the formation of the earth's crust with unique geomorphological and geological characteristics in 2003. This place contains giant and mysterious caves, including the Tiger Cave system including Dai A Cave, Kong giant sinkhole, Over Cave and Pygmy Cave. Follow us on a 3-day, 2-night tour to conquer the Tiger Cave system to explore the majestic nature in this world-famous land of caves. Source: https://www.youtube.com/watch?v=qgK0K6hgmig