Yekaterinburg's speleologists (scientists studying caves, underground ruins, tunnels, sewers, etc) are preparing for the expedition to Baysuntau Ridge in Karshi (Uzbekistan). They are planning to study one of the world's deepest caves, Boy-Bulok (1,415m deep, 14,270m long), RIA Novosti quoted a source at the Ministry of Sport and Tourism of Sverdlovsk Oblast.
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