60-hour exploration of the Phong Nha-Ke Bang caves and Kong Collapse

60-hour exploration of the Phong Nha-Ke Bang caves and Kong Collapse

Kong Collapse is a sinkhole of the Tiger Cave of Phong Nha-Ke Bang. It made headlines recently about whether this is the biggest sinkhole in the world or not. 60-hour exploration of the Phong Nha-Ke Bang caves and Kong Collapse:...
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