An international team of divers will be studying Russia’s Lake Goluboe (Blue) in early 2012 as part of an effort to search for underwater caves and artifacts.....
....According to some, there is a strong possibility that the lake, 258 meters (846 feet) deep and the third deepest karst lake in the world, could be the resurgence of one of the world’s largest underwater cave systems.
Studies on the river that connect to the lake found flow rate of the water to be about 8 cubic meters (26 cubic feet) of water per minute. In addition to the water, somewhere between 30 and 50 cubic meters (98 and 164 cubic feet) a day of dissolved gypsum also pass into the river, signalling erosion of cavities somewhere down below.
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http://cavingnews.com/20111229-divers-t ... -artifacts