Haunebu II – III WW2

German Flying Saucer Model kit companies like Airfix and Revell have released kits of the “Haunebu”, and it is featured in video games like X-Plane 11  and  Warplanes: WW2 Dogfight. Accounts appeared as early as 1950, likely inspired by historical German development of specialized engines such as Viktor Schauberger’s “Repulsine” around the time of World War II.

TR-3B Anti-Gravity Spacecraft
Black triangle (UFO)

It doesn’t exist officially. It uses highly pressured mercury accelerated by nuclear energy to produce a plasma that creates a field of anti-gravity around the ship. Conventional thrusters located at the tips of the craft allow it to perform all manner of rapid high speed maneuvers along all three axes. Interestingly, the plasma generated also reduces radar signature significantly. So it’ll be almost invisible on radar & remain undetected. This literally means that it can go to any country it likes without being detected by air traffic control & air defense systems. Military.com Wikipedia

Haunebu IV WW2
German Flying Saucer

The Haunebu IV is part of a series of alleged Nazi flying saucers that were purportedly developed during World War II, with claims suggesting they were advanced aircraft designed to win the war for Germany. However, there is no verified evidence that these crafts ever existed or were operational.

Die Glocke – Nazi Bell

(The Nazi Bell Conspiracy theory) Die Glocke was a purported top-secret scientific technological device, wonder weapon, or Wunderwaffe developed in the 1940s in Nazi Germany. Rumors of this device have persisted for decades after WW2 and were used as a plot trope in the fiction novel Lightning by Dean Koontz. First fully described by Polish journalist and author Igor Witkowski in Prawda o Wunderwaffe, it was later popularized by military journalist and author Nick Cook, who associated it with Nazi occultism, antigravity, and free energy suppression research.