National Geographic Travelのインスタグラム(natgeotravel) - 11月25日 02時06分

Photo by Robbie Shone @shonephoto | Explorers scour the surface of the Gorner Glacier in Switzerland in search of holes that might lead them down through the ice. In the middle of the night, when temperatures drop below freezing and there is no meltwater to worry about, these moulins and glacier caves are safe to enter. @NatGeoImageCollection

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