At 148 miles in length, Shuanghe Cave in China’s Guizhou province holds the honor of being the longest cave in Asia. No one knows it better than 61-year-old farmer Zhao Zhongguo. He’s spent the past three decades exploring the cave complex, documenting over 2,000 cave entrances and mapping it all by hand. Now, his discoveries have inspired scientists and government officials to survey the surrounding region, helping to bring international acclaim to the area.
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