Lake Bottomless: why they can't find the bottom of this water body for almost 200 years already

In 4 kilometers north of the city of Solnechnogorsk, which is located in the Moscow region, there is a lake called Bezdonnoye. At first glance, an unremarkable body of water is actually a very interesting place. For almost 200 years, Russian researchers are trying to find in Bezdonnoye ... the bottom. It would seem, what could be easier. Especially in the era of high-tech equipment, scuba tanks and oxygen tanks. But in the case of the Bottomless, it's not so simple. So, what's the catch?

A seemingly unremarkable place.

In his time Lake Bezdonnoye was studied by the famous Russian scientist Dmitry Ivanovich Mendeleev. For the sake of sporting interest he tried to find the bottom of the reservoir with the help of a 100-meter rope and a weight. However, as a result, he could not find out anything useful. Mendeleev never determined the exact depth of the lake. They tried to measure the depth of the lake in Soviet times as well. Attempts to find out the exact depth do not stop nowadays. Lake Bezdonnoye regularly attracts both researchers and amateur divers from all over Russia.

But really one of the most interesting lakes.

Of course, it would be a mistake to think that Lake Bezdonnoye goes for a hundred meters. In the best case its depth is several tens. However, so far in various state documents indicate a depth of 4.5 to 6.3 meters. At the same time, a reservation is always made that the exact depth of the reservoir has not yet been measured. A number of researchers believe that Bezdonnoye can go into the ground for 15-20 meters. Such conclusions can be made by analyzing the terrain: the hollow of the lake was obviously formed as a result of adjoining moraine hills.

It's a very peaceful place.

It is impossible to find the true bottom of Bezdonnoye because of a very large layer of sapropel - centuries-old deposits of clay and mud. Also in the lake there is a so-called “false bottom” of mineral and organic muddy sediments. It is physically impossible to overcome all this with ordinary means of depth measurement. At the same time, the researchers are absolutely sure that at the very bottom of the lake one or more springs flow into the lake and feed it.

Apparently there is a large amount of sapropel in the lake.

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