On 7 th Aug 2007 Evgeny Snetkov reported in the
Cavers Mailing List (which covers cavers from the former USSR) about connection, which was made on 2th Aug 2007 by expedition of the
Russian Geographic Society between Illuzia cave & Snezhnaya-Mezhennogo system, the depth amplitude of the whole system is - 1750 meters, which makes it the second deepest cave in the world. The total length of system is 23 km.
Brief info: The Snezhnaya-Mezhennogo-Illuzia system is located in the
Hipsta mountain range in Abkhazia on the Northern-Eastern shore of the Black Sea. The
entrances of caves are as follows (from left to right): 5th - Illuzia cave (entrance at 2385 m, depth: - 513 m, length: 1157 m), 6th - Mezhennogo cave (entrance at 2015 m, depth: - 1370 meters, length: 19 km ), 7th - Snezhnaya cave (entrance at 1980 m ).
Here is some photos from the last year expedition to Illuzia Cave by one of the expedition members (Maxim Popov)