National Geographic Travelのインスタグラム(natgeotravel) - 1月13日 20時26分

Photo by @shonephoto (Robbie Shone) // Below the surface of the Gorner glacier, in the Swiss Alps, a glaciologist traverses along a tunnel carved by water through the ice. The tunnel continues all the way down to the base of the glacier. Understanding the formation of these glacier caves helps understand the speed in which these glaciers are melting.

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