ナショナルジオグラフィックのインスタグラム(natgeo) - 12月10日 21時28分

Photo by @shonephoto (Robbie Shone) - Emerald swimmer underground in Postojna jama (cave). The water might be crystal clear but it is very cold. Exploring these beautiful caves is not always pleasant! Postojna jama is a 24,340m (15miles) long karst cave system near Postojna, in southwestern Slovenia. It is the second-longest cave system in the country as well as one of its top tourism sites. The caves were created by the Pivka River, flowing through the limestone.

This portfolio of photographs was 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. For more from this amazing story, please follow the link in the bio of @shonephoto. Words by Andrew Bisharat
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