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Many questions still remain unanswered, including the origins of the lake, believed to be 25 million years old, and the unique organisms that live in it.

Russia concludes research of Lake Baikal with mini-subs in 2009
Mir mini-subs arrive at new research site in north Baikal
Putin proposes stricter punishment for environment pollution
Russian mini-subs discover alternative fuel resources in Baikal
Mini-subs study mud volcano in Lake Baikal
Mini-subs discover unique amphipods in Baikal
Cans and Kolchak gold - Mir mini-subs carry out Lake Baikal research
Russian researchers at Lake Baikal to increase time underwater
Hunt for Baikal tsarist gold postponed over bad weather
Russian researchers take mini-subs to Baikal's north
Russian PM Putin dives to bottom of Lake Baikal
Russian mini-subs may join search for Atlantis in 2011
Researchers say Lake Baikal younger than earlier thought
Baikal team searches for sunken carriages from Russian Civil War
Mini-sub recovers sensor placed last year deep in Lake Baikal
Lake Baikal exploration team to focus on science, not artifacts 
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CAIRO, May 26 (RIA Novosti)