https://en.wikipedia.org/wiki/Invention_Secrecy_Act
May 14, 1951
While the combustion engine works via explosive technology, the "UFO" or "anti-gravity" (interdimensional) technology works by implosion, which is what the Fuhrer was on the verge of mastering in Antarctica after his discovery of the Flash Frozen demi-Gods.
I've personally seen a UFO (orb); it was in rural, Western Quebec about an inch over a treeline to my East (few klicks to the treeline at the end of the lake) 10 years ago, the same night as the propane depot explosion in Toronto.
Look at the rise and fall of UFO sightings and line them up with location and times of nuclear testing. Look at FOIA and the increases around aircraft carriers (nuclear powered). They come from the "inner earth" (poles). The earth isn't "hollow" per se, but rather a gateway to a different place.
Perhaps a dimension where Jesus hailed Caesar and the dark ages never happened.