Apparently a lot of stuff will soon be released from government vaults, and we sorta have ol' Harry Reid of Nevada to thank.
https://www.nytimes.com/2021/05/21/s...gtype=Homepage
Something seems off to me about the whole thing, as if someone is trying to pull our leg in a big way.
If these strange propulsion capabilities really existed, someone would have cashed in on them by now, and they wouldn't have any incentive to be seen if the point was to keep them truly a secret.