National Geographic Travelのインスタグラム(natgeotravel) - 4月29日 09時56分

Photo by Robbie Shone @shonephoto | Explorers emerge from a giant black hole with a notebook full of survey data from previously unexplored galleries. In the entrance series of San Wang Dong cave, China, this passage is called The Sea of Tranquility. Here lies the remains of old Nitrate mining that covers the floor in the form of harths, pits and unwanted spoil.

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