Tham Khoun Cave, an Incredible Hidden Cave in Laos

American cave explorer Dave Pierce marvels at giant cave pearls, some with a hexagonal shape, in the “Oxbow” section of the cave. These may well be the largest known examples on earth. Cave pearls grow like pearls in an oyster with concentric layers of calcite slowly building up year after year on March 2015 at Tham Khoun Ex, Laos. (Photo by John Spies/Barcroft Media/ABACAPress)
Tham Khoun Cave, an Incredible Hidden Cave in Laos
   
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