'MYSTERIOUS ABYSS". That`s how locals call it. Nobody researched it, nor described it. Nobody knows when or how it appeared.
Some kind of negative/bad energy radiates from it and people do not stay near for very long. There is not many fish. The depth is about 10 meters, of which-3-5m of sediment layer. It is said that remains of the retreating army of Napoleon sank something here. There are assumptions that it is a meteorite strike crater