Over 100 International tourists have listed for the hottest Vietnam adventure tours - Discovering the biggest cave in the world - Son Doong cave in the poor central province Quang Binh.
The local Government will give tourists two tours in seven days each month with cost US $ 3,000 and the other three tours in five days with cost US$ 2,300 each month. All these tours will be started in the August, 2013.
Every group gets 6 tourists and escorted by 15 local guides. if all of these first tours are fine, the dventure tours in Son Doong Cave will be held officially from the February to the August every year.
This biggest cave in the world - Son Doong, located in the national park Phong Nha - Ke Bang, was first discovered in 1991. Its existence was publicized in 2009 by a group of British scientists from BCRA, led by Howard Limbert, after their surveying trip in Phong Nha-Ke Bang Park.
According to Limbert, the cave is five times larger than the nearby Phong Nha cave, previously considered to be the largest in the world.
Son Doong cave is found to have a length of at least 5 kilometres. It is estimated to be 200 metres in width and 150 metres in height.