Are the mysterious metallic spheres of Siberia really of Extraterrestrial origin?

It is very well-known that since ancient times, Siberia has been a very mysterious place. Numerous incredible findings are connected to that part of Russia. One of those mysterious places in Siberia is the area of Yakutia, virtually unexplored and very inhospitable, full of swamps, it is a place that locals avoid at all costs since, according to them, anyone that enters the Valley of Death never returns.
There, in the enigmatic and mysterious area of Russia, people have found strange metallic objects whose purpose and origin are as controversial as inexplicable to science.

The area of land is known by locals as Uliuiu Cherkechek, the Valley of Death, in Siberia. There, you can find a “disturbing” number of metallic spheres believed to be of extraterrestrial origin. Mysteriously, according to those few who have ventured out and studied these strange “alien spheres”, these objects are strategically positioned to protect against asteroids and “hostile energies.” Local legends support this theory.
Beyond any speculation, the truth is that this mysterious area of land has been a protagonist of several catastrophic events such as the great Tunguska explosion in 1908, Chulum in 1984, and Vitim, in 2002.
People who live in the vicinity of this hazardous place believe there is no mystery to it: the Death Valley owes its name to countless deaths and illness that marked the fate of anyone who dared to roam the vicinity of any of these metal spheres which are, according to rumours of extraterrestrial origin.
Legends state that here, in this inhospitable landscape live to old demons of the “Taiga.”
The last scientific expedition, consisting of three geologists, an astrophysicist, a mechanical engineer and several assistants, investigated the site, they found huge metal formations, such as domes, half-buried in the swamps.

An area of land showing the remains of where these mysterious metal spheres once stood? – The image needs source.

In their short time investigating the metallic spheres, they managed to find five of these metallic spheres, but scientists could not continue their expedition and investigate further since serious illness afflicted several of the members of the expedition. It is believed that these metallic spheres give off some sort of radiation and because of it, anyone who ventures near them falls ill.
Lone hunters who have ventured into the area where the metallic spheres are found say that there are many metallic spheres found in the area, some of them are submerged under water while other spheres are half-buried in the ground. Locals refer to these structures as “olguis” and these are said to be forged out of an unknown metal, believed to be “copper-like” in nature. The metal of these spheres is said to be extremely resistant and hard, no one has been able to analyse them since many fear approaching these spheres. The few tests that were made were ignored by laboratories who have failed to identify their composition and origin.

Expedition into the Mysterious Death valley

Local hunters say that over time, these metallic spheres sink into the ground and disappear from sight. They leave behind strange stains where vegetation cannot thrive again. It is said that tribal elders have declared the area as cursed.
Strangely, we have failed to find any images of these mysterious metallic spheres which leaves us wondering where these actually exist or are just legends as many skeptics suggest.
In a letter, Mikhail Koretsky from Vladivostok who visited the mysterious area wrote:

“I was there three times. The first time was in 1933, when I was ten – I travelled with my father when he went there to earn some money – then in 1937, without my father. And the last time was in 1947 as part of a group of youngsters.
“The ’Valley of Death’ extends along a right-hand tributary of the Viliuy River. In point of fact it is a whole chain of valleys along its flood lands. All three times I was there with a guide, a Yakut. We didn’t go there because life was good, but because there, in the back of beyond, you could pan for gold without the threat that at the end of the season you’d be robbed or get a bullet in the back of your head.
“As for mysterious objects, there are probably a lot of them there, as in three seasons I saw seven of those ’cauldrons’. They all struck me as totally perplexing: for one thing, there was their size – between six and nine meters in diameter.
“Secondly, they were made of some strange metal. Everyone has written that they were made of copper, but I’m sure it isn’t copper. The thing is that even a sharpened cold chisel will not mark the ’cauldrons’ (we tried more than once). The metal doesn’t break off and can’t be hammered. On copper, a hammer would definitely have left noticeable dents. But this ’copper’ is covered over with a layer of some unknown material resembling emery. Yet it’s not an oxidation layer and not scale – it can’t be chipped or scratched, either.
“We didn’t come across shafts going down into the ground with chambers. But I did note that the vegetation around the ’cauldrons’ is anomalous – totally different from what’s growing around. It’s more opulent: large-leaved burdock; very long withes; strange grass, one and a half or two times the height of a man. In one of the ’cauldrons’, the whole group of us (six people) spent the night. We didn’t sense anything bad, and we calmly left without any sort of unpleasant occurrences. Nobody fell seriously ill afterwards. Except that three months later, one of my friends lost all his hair. And on the left side of my head (the side I slept on), three small sore spots the size of match-heads appeared. I’ve tried to get rid of them all my life, but they’re still with me today.
“None of our efforts to break off even a small piece from the strange ’cauldrons’ was successful. The only thing I did manage to bring away was a stone. Not an ordinary one, though: half of a perfect sphere, six centimeters in diameter. It was black in colour and bore no visible signs of having been worked, yet was very smooth as if polished. I picked it up from the ground inside one of those cauldrons.
“I took my souvenir of Yakutia with me to the village of Samarka, Chuguyevka district, Primorsky region (the Soviet Far East), where my parents were living in 1933. I was laid up with nothing to do until my grandmother decided to build a house. We needed to put glass in the windows and there wasn’t a glass-cutter in the entire village. I tried scoring it with the edge of that half of a stone sphere, and it turned out to cut with amazing ease. After that, my find was often used like a diamond by all our relatives and friends. In 1937 I gave the stone to my grandfather, but that autumn he was arrested and taken to Magadan where he lived on without trial until 1968 and then died. Now no-one knows where my stone got to…”
In his letter, Koretsky stresses that in 1933 his Yakut guide told him that:
“…five or ten years before, he had discovered several spherical cauldrons (they were absolutely round) that protruded high (higher than a man) out of the ground. They looked brand new. Later the hunter had seen them again, now broken and scattered.”

Russia’s death valley remains a mystery for scientists, researchers and adventurers and while many suggest that these stories are exaggerated, some believe that there is truth in them. Extensive research has not been done in the area, and the little research that has been performed has remained classified, far away from the eyes of society.