Son Doong cave (“Mountain River cave” in Vietnamese) is the biggest known cave in the world. The cave was found by a local man in 1991 and was discovered in 2009 by British cavers, led by Howard Limbert. It was created 2-5 million years ago by river water eroding away the limestone underneath the mountain Where the limestone was weak, the ceiling collapsed creating huge skylights.
In August 2013, the first tourist group explored the cave on a guided tour at a cost of US$3,000 each and spent 7 days and 6 nights for the tour.
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