
BEIJING, April 17, 2016 (Xinhua) -- Expedition members work within the Miao Room Chamber, China's largest cave chamber by volume, in Ziyun County of southwest China's Guizhou Province, April 14, 2016. In 2014, National Geographic announced Miao Room Chamber, with a volume of some 19.78 million cubic meters, as the world's largest cave chamber. (Xinhua/Ou Dongqu)
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