There is a hypothesis that at least some of the man-made UFOs are equipped with anti-gravity propulsion systems that use neutrino rays. In any case, some of the ufological sources refer to some physicists who were allowed to study the crashed vehicles and were present during the experiments carried out in some secret hangars.
From the ufological literature, "Area 51" is well known, located in the United States. However, it is argued that similar secret hangars for studying UFOs were located in the USSR. You can read about one of such Soviet research bases, where the anti-gravity installations of alien vehicles were studied, in the book "Real stories and encounters with the paranormal" (compiled by S. Reutov).
And here's what it says:
The effect of neutrinos may be confused with neutrons, and neutron fluxes do indeed have dire consequences for living organisms. It is also known that UFOs often have a negative impact on observers. It is not clear only why it is argued that it is the neutrino rays that are to blame for this. It is also not entirely clear what relation they have to the anti-gravity effect or is it still some kind of side effect. In any case, it is better not to approach the fallen unidentified vehicles, especially since they may turn out to be fragments of a spy satellite with a nuclear installation. And increased radiation, as you know, not only does not benefit health, but also significantly reduces life expectancy.
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