Photo taken on Feb. 21, 2021 shows the protected reef created about 1,200 years ago to measure the changes in water levels at Baiheliang Museum, China's first underwater museum built about 40 meters below surface in the upper reaches of the Yangtze River off the coast of Fuling City, southwest China's Chongqing Municipality. Baiheliang Museum reopened to public recently after a four-month renovation. (Xinhua/Liu Chan)
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