According to Telegraph, there are still many unexplored places of underground cave system in the world. Record books are almost rewritten every year and some of the largest caves on the planet have only recently been discovered. However Son Doong in Vietnam is the largest known cave passage in the world by volume, it was found in 1990 and only fully explored in the last few years and it’s possible for tourists to visit directly.

Only 1,000 visitors are allowed to enter the caves every year. For each four-day and three-night program, visitors must pay £ 2,245 (equivalent to $ 3,000) to explore, experience a large cave so far that has its own sub-climate system compared to other locations. At the tallest point, the cave can accommodate a 40-storey skyscraper, while at its widest point, there’s enough room for a 747 to fly through.

At the promotion program of Quang Binh tourism through cinema in Hollywood and New York Time Travel show fair at the end of January last, Son Doong cave was also voted by international press as one of the best tourist destinations in the world

Especially, in 2019, Quang Binh tourism will carry out many major programs with global effects, which which will carry out a program to explore a 600m long underwater path that has never been discovered inside Son Doong Cave to find a way from the existing cave system to Thung cave with the participation of 4 cave diving experts who participated in the rescue campaign of the young footballers in Thailand. If this expedition succeeds, it will reset the map of Son Doong cave system to recognize its largest natural cave in the world. At the same time, coordinate many famous TV channels in the world such as Animal Planet and National Geographic to carry out specialized programs at Son Doong and Phong Nha - Ke Bang caves to continue introducing and promoting Quang Binh tourism to the world./.