Locals often call it a “ghost lake”, because every 5-6 years all the water disappears from the lake, and then comes back. According to legend, in the old days, a greedy rich man lived on its shore. Angry peasants drowned him, and since then his greedy spirit from time to time drinks all the water in the lake, and then again falls into oblivion. Geologists also suggest that the water goes into karst caves under the bottom of the reservoir. Ufologists have their own version, as if there is an alien base under the lake.