Last day of Ambassadors' excursion into Son Doong Cave

By VTV   May 17, 2016 | 10:36 am GMT+7
Today, May 17 is the last day of the excursion into Son Doong Cave of the group of seven ambassadors to Vietnam and the U.S. Assistant Secretary of State. Let’s take a look at their five-day expedition into the world’s largest natural cave.
 
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