ナショナルジオグラフィックのインスタグラム(natgeo) - 1月26日 20時38分

Photo by Robbie Shone @shonephoto | This is a view of the entrance to the Geltenbach Hoehle cave as a Swiss team of explorers begin their decent into the Gastental valley below. During the summer months, a giant waterfall spills from the entrance—only in the winter is it safe to explore the cave.

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