to commit a crime and to hide evidences can be proved by facts but in this case the question is who devised a plot and why. But without these facts the conspiracy versions are baseless and have to be avoided because trying to prove such version one has to give validity facts, i.e. names of conspirators and their motivation. If the elements and motives of crime cannot be proved a conspiracy theory becomes harmful because it distracts from true reasons of the accidents and disturbs to prevent them in future. And sometimes it becomes even dangerous because in this case it gives way to slanderous attacks.
4 – the accident was «abnormal», i.e. caused by the «unusual» event which has not been connected neither with «usual» natural, nor technical nor «criminal» events. The "UFO version", «versions» about the unusual (paranormal) natural phenomena ("infrasound", «fireball», «cold plasma») or the accidental poisoning «version» are considered to be these ambiguous and unsupported assumptions.
But ambiguous versions have not been proved by specific explanation about the cause of the accident and whether «UFO» or a "toxic substance» or an «anomaly» took place as well as under what circumstances it happened. As long as neither UFO traces nor any traces of poisoning, nor the evidence of the abnormal phenomena have not been found. The belongings, food and the first-aid kit of the lost group didn’t contain any chemicals which could «stir up their minds».
Since then the opinions of many (but not all) researchers about causes of accident divided into two main directions: natural accident or "technogenic and criminal" accident (conspiracy version). Supporters of natural accident said that Dyatlov’s group accident is a failure usual for tourists and it wasn't connected with secret weapons tests or any crimes. There were attempts to unite «natural» and «technogenic» versions but such attempts didn't succeed. Supporters of «natural» accident also didn’t come to complete agreement.
The master of sports on tourism Moisey Abramovich Axelrod proposed a version about an avalanche being a main cause of accident. He has built a connected scene of events and pointed to many peculiarities in behavior of Dyatlov’s team and details of events. His «avalanche version» also included the steps describing loss of equipment and subsequent freezing of Dyatlov’s group under the conditions of cold weather, wind and snowstorm. Axelrod thought that after descent of an avalanche and having been injured Dyatlov’s group were rescuing the wounded and tried to return to the camp but lost their way because of the dark and snowstorm. Their attempts to come back to the tent on the mountain opened to wind appeared to be doomed. Axelrod didn't refuse the «technogenic» causes of the accident believing that the descent of an avalanche could be externally stimulated by weapons tests or military maneuvers.
But some aspects of his «avalanche» version met questions and objections which had no answers. There were objections according to which the mountain slope was not rather steep and there was no trace of avalanche. Evidences of searchers and tourists also showed that there were no signs of the avalanche in this part of the mountain. They said that Northern Ural is a region that is not known for avalanches and there were no accidents caused by avalanches. It seemed that the «avalanche» version obviously didn’t correspond to the conclusions of forensic examination. After all, it looked like Dyatlov's team was so heavily injured that couldn’t go down. And the presence of 8–9 pairs of footprints on the slope proved that all group or almost everyone were going down in a file joining hands.
All in all Axelrod was not able to overcome all objections and explain all events of the accident up to the end and his «avalanche» version with avalanche and snowstorm hasn’t had any supporters among skilled tourists for a long time. The theory appeared in 1991 (was written and then published in 1993 in the article of the book by N.A. Rundkvist «Hundred days in the Urals», 1993), much later criminal case had been closed and wasn't considered like an «official version» of the investigation. This version didn't have sufficient evidences and strong protection against attacks of opponents that’s why it was necessary to work on it to strengthen it or to give up.
The versions about «infrasound» influence or attack of a rogue bear were put forward as «natural» versions. Actually these natural versions are versions about some «unusual», abnormal phenomena. And even now in TV programmes they try to explain that the accident was caused by «cold plasma» and some special type of «fireball», «infrasound» or other anomalies. These «versions» have always been and remain only assumptions which have no evidences and direct influence. The same can be said about «criminal» causes of accident, while there are no evidences there is no subject matter. After all, it is possible to think up everything. But it is necessary to prove only what actually took place and what is based on reliable facts and evidences.
So a number of natural and «criminal» versions got hung up without support because they failed any evidences and didn’t have any confirming facts. Criminal «versions» fell into this «hopeless» group: «mansiyskaya», «household quarrel» (a conflict in the team). And also acute alcoholism or any other substances poisoning, including toxic «gases» and «propellant fuel». As well as assumptions about «death squads or escaped convicts» along with attack of "special forces" or criminals and all kinds of such options. Obvious weakness of all «criminal» versions consisted in absence of motives of crime. All things belonging to Dyatlov’s group have been found, there were no irrelevant things at the place of the accident and nothing of Dyatlov’s group belongings, including valuable ones, disappeared from the Tragedy scene.
Many searchers of Dyatlov’s group and a lot of skilled tourists supported the «technogenic» versions (including «UFO version»). It seemed that they had solid validation by way of facts about «fiery spheres» flight and the fact of radiation found on clothes of Dyatlov’s group. But these facts were weak because they lacked any explanation: what kind of phenomenon these «fiery spheres» were and where this «radiation» came from. There was no explanation how these strange phenomena affected the accident, whether there was a direct link or any influence and its importance. At the place of the accident there were no signs of these influences: neither traces of falling «rocket» nor increased radiation have been found. Therefore in order to analyze the role of these facts in the accident they were to be checked and explained. Below we give these explanations and they show the real worth of these facts and how they were connected with the accident and with legends about it.
To explain the accident «technogenic» and «criminal» versions were trying to be united. These attempts have resulted in «elimination» and «imitation» versions. The «elimination» version means intended extermination of Dyatlov’s group to keep «privacy» of some «tests», what participants of group witnessed accidentally. The «elimination» was also suggested as a result of mistaken extermination of escaped criminals. Except that the elimination was quite strange without any evidences of weapon impact. This difference was eliminated by «imitation» versions. The «imitation» was described as a special murder with evidences fabrication on the crime scene which led to that uncertain picture at the place of the accident. But all arguments about «elimination» and «imitation» nevertheless were unconvincing because of the absence of motive for the crime. They became solid and valid only together with «technogenic» version. Otherwise there were no explanations for authorities’ cruelty towards ordinary group of tourists and for the presence of criminals in this god-forsaken place. It is impossible even to reach this place without necessary winter equipment and marching skills, products and terrain knowledge saying nothing of surviving there. To prove «elimination» and «imitation» versions there were also different «arguments» and «evidences» which reduced to the proof of presence of outsiders in the zone of the accident. All these «additional» facts didn't pass the verification that is told in the article «Destruction of unchecked facts and misconceptions. Why and how the accident traces have been lost».
For the correct understanding of the accident we had to collect all relating to the investigation information with the unchecked and false facts and to explain these facts in a proper way. It was necessary to remove all «dust» of misconceptions collected for 49 years which didn’t let to understand the accident correctly. And then to explain the accident on the basis of the verified facts,
