ナショナルジオグラフィックのインスタグラム(natgeo) - 12月18日 02時24分

Photo by @shonephoto (Robbie Shone) - Suspended on a thin rope and immersed by light from a tiny opening in the Earths surface, an explorer makes his way up 900 ft in Kačna jama (cave) near Divača, in Slovenia. The cave is the third longest cave in Slovenia and is one of several locations that offers a gateway down to the mighty Reka River. This portfolio of photographs we have been sharing were shot for @NatGeoAdventure from the famous river caves of Slovenia, birth place of speleology and home to the 'human fish'. With my caving colleagues I visited 8 caves, each one varied and different with its own personality.

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• NatGeoAdventure