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I wonder how they even managed to make these crafts, seems impossible doing this in the 30s and 40s when the US in the mid 80s with unlimited resources and funds couldn't figure out how it works. they couldn't even tell what they were made of.
even today we can only produce a couple of unstable atoms of element 115 which is apparently needed to power these crafts so we are probably hundreds of years away from building similar crafts.
and thats all according to Bob Lazar who is the most credible source for UFOs. this guy is 100% legit since he exposed Area 51 and knew flight test schedules of the UFOs at the base.