In the Leningrad region, at a distance of 11 kilometers from Kamennogorsk (formerly Finnish Antrea), near the village of Krasny Sokol (formerly Sokkala), there is a famous rock massif with caves and cavities of unknown purpose of artificial origin.
In general, the surroundings of Antrea are rich in archaeological finds. The earliest are from the Neolithic era. At the beginning of the last century, stone and bone fishing tackle and tools were found here, as well as the world's oldest surviving fishing net made of willow bark, more than 10 thousand years old.
In total, six small caves were discovered in the rock mass near Krasny Sokol, four of them are located in the fractures of the rocks, and two are well accessible, you can get into them from the foot of the rock mass.
These two accessible caves are ellipsoidal, one about four meters long and about two meters in diameter, the other slightly smaller.
The slope of the "floor" of the caves is directed towards the entrance. The floor is polished, but the "polishing" is not mirror-like, but as if it was rubbed over the centuries by people entering and leaving. On the ceiling, the surface is fairly flat, but not "polished".
Near the entrance to the caves, granite slabs lie flat on the ground, as if cut off from a granite massif. It may seem that they once covered the entrance to the caves.
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There are various versions of the origin and purpose of these caves - from utilitarian-historical to fantastic.
Different versions are put forward about the origin of these caves. We will try to briefly introduce you to them.
The first refers to the version that the caves were used by the local population as a refuge during enemy marches. This was the old Finnish legend. However, they are more likely to touch caves in cracks - there are caves about thirty meters long, in which up to 100 people could hide.
As for the two ellipsoidal caves, in which only a few people could fit, their purpose is less clear. From realistic, though exotic assumptions, they could be used as saunas. This is indirectly confirmed by traces of burning on the ceiling and the floor polished by visitors. Although, soot could appear quite recently. The option is real, given the love of Finns for saunas. If a fire is kindled in such a cave, then the walls will heat up and, then, will evenly, from all sides, give off heat according to the principle of a bath on a black or Russian stove.
However, some researchers, in particular, Sergei Sall, Candidate of Physical and Mathematical Sciences, believe that these are structures of the ancient megalithic (Hyperborean) civilization, physically representing Helmholtz resonators. The classic Helmholtz resonator is a spherical vessel made of copper with an open thin neck. It was first made by Helmholtz in the middle of the 19th century to study sound signals.
S. Sall believes that these resonators in the rock mass were infrasonic weapons, and the slabs nearby are the remains of the control room. Fuel is added to the fire of this hypothesis by the information that the Germans from Ahnenerbe explored these caves during the war years, and when leaving, according to the testimony of local residents, blew up several entrances. On YouTube, you can find a related video by typing, for example, “red falcon resonators. Sall.
From simple assumptions, another option comes to mind - the use of caves for ritual purposes precisely in connection with their properties of resonators. The local Finnish peoples in pre-Christian times, and later, like many other peoples, had their own healers and soothsayers. Even in Andersen's fairy tale "The Snow Queen", written in modern times, there is such a heroine - an "old Finn". If such a soothsayer - a soothsayer (oracle, in a word), spoke while sitting in a cave - a resonator, then this should have made a strong impression. Distorted ("like from a bottle"), the voice of the soothsayer was supposed to lead naive listeners into religious awe: after all, they had just spoken to him and his voice was ordinary, and after he entered the sacred cave, spirits settled in him and he broadcasts their voices …