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Hang Son Doong, the World's Largest Cave

Take an otherworldly journey through Vietnam's Hang Son Doong, the world's largest cave, both from the ground and seen from a drone. Hang Son Doong, meaning "Mountain River Cave" in Vietnamese, was just dicovered in 1991, and wasn't surveyed until 2009. The cave is about 9 kilometers long (5.6 miles), and is punctuated by 2 large dolines, areas where the ceiling of the cave has collapsed, allowing sunlight to enter and resulting in the growth of vegetation including trees. This video was filmed by Ryan Deboodt near the entrance and the first and second dolines, which are 2.5 and 3.5 km inside the cave respectively (6:18).

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