The expedition of the Ukrainian Speleological Association into the caves of the Ortobalagan valley, Gagra massiv, Abkhazia.

The expedition of the Ukrainian Speleological Association "Call of the Abyss in 2015" into the caves of the Ortobalagan valley, Gagra massiv, Abkhazia.

The Ukrainian Speleological Association expedition "Call of the Abyss in 2015" into the caves of the Ortobalagan valley took place from the 3rd till the 26th of August.15 speleologists from Ukraine, Crimea, Israel, USA, Iran took part in this expedition . Yuri Kasyan was the leader of the expedition..

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