See inside one of the longest caves in the world. A recent expedition by Chinese and French explorers discovered a new part of what they now say is the tenth longest explored cave in the world. China’s Shuanghe Caves in Guizhou Province previously held the record for 11th longest cave. The new discovery now puts the cave at a total length of more than 124 miles.
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See Inside a 124-Mile-Long Cave | National Geographic