National Geographic Travelのインスタグラム(natgeotravel) - 12月19日 22時07分

Photo by Robbie Shone @shonephoto | Below the surface of the Gorner Glacier in the Swiss Alps, a glaciologist from Aberystwyth University traverses along a tunnel of ice. Carved out by water, this crack in the glacier has been enlarged over time by erosion and melting.

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