Tian Xing, China: Climbers abseil down the Miao Keng shaft, one of the world's deepest. It starts 150m below ground, and the descent takes two hours. The British and Russian group of cave enthusiasts ...
A group of climbers have explored one of the world's deepest underground shafts, spending almost a week at a time beneath the earth. Deepest cave shaft. Here in China's Miao Keng's underground caves, ...
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