ナショナルジオグラフィックのインスタグラム(natgeo) - 3月15日 12時05分

Photo by Robbie Shone @shonephoto | An Italian explorer edges his way along a narrow passage carved out by meltwater, deep beneath the surface of the Gorner Glacier in Switzerland. What's around the next corner? Will it end soon, or will it keep going? Scientists study these icy tunnels to better understand how and at what rate glaciers move.

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