At the time of detection Son Doong cave, Mr. Ho Khanh do not know the value of the cave. Not long after that trip, he quit looking back downs and farming. Over 15 years later, the whereabouts of this cave is still in darkness. Until 2006, when an expedition of the British Royal Society to search for new caves in Phong Nha - Ke Bang, his new Khanh brought his story to tell them. It was then that the journey to find the ancient cave year started
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