ナショナルジオグラフィックのインスタグラム(natgeo) - 11月23日 04時39分

Photo by @shonephoto (Robbie Shone) - At 3,482 m asl (11,430 ft) the small cave at the top of the Jungfraujoch in Switzerland, is Europe's highest known cave. Whilst not technically demanding, we had to be very careful when traversing through the cave so as not to damage the large and beautiful hoar frost crystals clinging to the walls. Every hand and foot was placed carefully as we kept our head down and crawled along the passage. We were there as part of a scientific study looking at permafrost in the Alps.

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