ナショナルジオグラフィックのインスタグラム(natgeo) - 11月27日 03時08分
Photo by @shonephoto (Robbie Shone) - At 3,482 m asl (11,430 ft) the small cave at the top of the Jungfraujoch is Europe's highest known cave. Once we were inside and away from the entrance where the public pass by, the temperature dropped and ice crystals grew out from the walls in increasing numbers the further we went, reaching a point where the tunnel was almost completely blocked by these giant ice crystals. We were there as part of a scientific study looking at permafrost underground in caves in the Alps.
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