been passed for the first time in the history of speleology. 2005 February–March: the Ukr. S.A. expedition led by Jurij Kasjan. In the Main Branch, continued exploring the "Windows" series where many side leads and several sumps were tested. A sump at −1,980 m called "Kvitochka" was passed by Nikolay Solovyov, and a continuation found behind it. July: the CAVEX team expedition. Explored the section beyond the Kvitochka Sump to a further sump called Dva Kapitana ("Two Captains") at −2,140 m. August: the Ukr. S.A. expedition led by Nikolay Solovyov. Continued digging and broke through the boulder choke at −500 m in the Nekuybyshevskaya Branch, explored it to the next boulder choke at −640 m. October: the Ukr.S.A. expedition led by Jurij Kasjan. The exploration beyond the Kvitochka Sump had been cancelled due to a sudden flood. Established a camp at −1,960 m. Performed a verification survey to −1,200 m by hydrolevelling to assess the precision of the standard Ukr.S.A. survey (the Russian Geographic Society group). Continued climbing in the Lamprechtsofen tributary to +210 m relative to the junction. 2006 August–September: the Ukr.S.A. expedition coordinated by Jurij Kasjan. In the Main Branch the terminal sump called Dva Kapitana ("Two Captains") was tested by Gennadiy Samokhin to depth of 17 m, which extended the total depth of Krubera Cave to . In the Nekuybyshevskaya Branch, a group led by Kyryl Markovskoy broke through the boulder choke at −640 m and explored a continuation to −1,004 m. 2007 January: the CAVEX team expedition. Performed a dive in the terminal "Dva Kapitana" sump and claimed it to reach −30 m depth below the water table. However, characteristics of morphology of the underwater passage reported by the team were not confirmed by the subsequent exploration, and no safety line was found deeper than 16 m. August–September: the Ukr.S.A. expedition led by Jurij Kasjan. In the Main Branch, Gennadiy Samokhin dived the terminal "Dva Kapitana" Sump for a length of 140 m and depth of −46 m, which set the new depth for Krubera Cave at . After an elbow at -35 m the underwater passage continues to depth under steep angle. Also in the deep parts of the Main Branch, several side passages and sumps at various depths were explored. In a side branch which previously ended at −1,775 m by the "Blue Lake" sump, a series of air-filled passages was explored behind the