This is extremely interesting. Recently it was revealed via a FOIA request that the DIA's research on UFOs was more extensive than we thought. Covered in the documents are the subjects that the DIA was and may still be actively pursuing: antigravity, interdimensional travel, survival of tissue in oxygen-deprived environments, and even travel via Stargate-like portals- also mentioned is zero point energy. I have always heard claims by UFO researchers that all this stuff was real, but failed to believe it. Now I'm not so sure...
https://futurism.com/secretly-funded-research-ufos-wormholes
https://futurism.com/secretly-funded-research-ufos-wormholes