Vladimir Iljukhin Cave System: breakthrough behind the fourth siphon

Vladimir Iljukhin Cave System - Arabika Massif, Western Caucasus
Caving Club "Sokol'niki-RUDN", Moscow, Russia

"During the 2005 summer expedition to the Vladimir Iljukhin Cave System (Arabika Massif, Western Caucasus) a noticeable result was achieved: a successful dive through the fourth siphon at –1240m, the first attempt since 1989 when the siphon was reached and tested for the first time, resulted in the discovery of a post-siphon continuation."

Full article: Speleogenesis

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