National Geographic Travelのインスタグラム(natgeotravel) - 12月23日 06時05分

Photo by Robbie Shone @shonephoto | Two cavers return to the surface after exploring this giant moulin on the Gorner Glacier in Switzerland. The temperatures are much colder during the evening than during the day, which reduces the risk of the flowing meltwater that makes these moulins so dangerous.

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