It’s an incredible clip of Son Doong Cave from of ryandeboodt.com inside “an extraordinary cave”
Located in Phong Nha-Ke Bang National Park, Quang Binh Province, Vietnam, Hang Son Doong is part of the underground system connected to more than 150 different activities in Vietnam, near the border with Laos
Limestone mountains Vietnam-Laos border region has many caves, such as the Phong Nha has been known for a long but Son Doong cave has been discovered only in 1991 when Ho Khanh, a local people stumbled out into the isolated store to avoid the rain. By some time in 2006 when the expedition Association Royal cave to this area, the Ho Khanh new poll to tell them.  it’s really hard for his new find their store which is located deep in the jungle with quite dangerous terrain, away from major roads and can not be found on Google Earth. Under his guidance, they went deep into caves, photography, surveying and collecting scientific data. They also spent a great honor for this cave named Ho Khanh.
April 22, 2009, the delegation Association Royal Cave Limbirt led by Howard announced the cave and found that the size of Son Doong cave is actually the world’s largest.