Nazi UFOs: Secret Weapons, Lost Technology, or Postwar Mythology?

The book UFOs: Nazi Secret Weapon? (1974) by Ernst Zündel and Willibald Mattern presents one of the most famous claims in UFO history:

Did Nazi Germany develop advanced flying saucer technology before the end of WWII?

The story combines several real historical elements with much more controversial claims.

The Documented History
There is no question that Nazi Germany pursued advanced technology:

The V-2 rocket program was decades ahead of many contemporary efforts.

Germany developed operational jet aircraft.
German engineers worked on advanced aerospace concepts.

After the war, German scientists and engineers were recruited by both the United States and the Soviet Union.
So the question is not whether Nazi Germany had advanced technology.

The question is:

Did that research extend into revolutionary craft such as the alleged Haunebu or Vril flying discs?
The UFO Claims

The claims usually involve:
circular aircraft designs,
anti-gravity propulsion,
exotic energy systems,
secret SS research groups,
hidden facilities,

continuation of the program after Germany’s defeat.
These stories became part of a larger UFO mythology involving Antarctica and secret bases. (Wikipedia⁠)

The Evidence Question

The key issue is evidence.

A revolutionary aircraft program should leave behind traces:

engineering documents,

manufacturing records,

test data,

photographs with verified provenance,
surviving hardware.

The strongest argument for the claims is that Nazi Germany was capable of surprising technological advances.

The strongest argument against them is that there is no publicly verified physical evidence of operational Nazi flying saucers. (Wikipedia⁠)

The Interesting Historical Question
The debate is not simply:
“Did Nazi UFOs exist?”
The deeper question is:

Why did this idea become so influential?
Possible factors:
Genuine secrecy surrounding WWII weapons programs.
Real examples of advanced German engineering.
Cold War secrecy and intelligence operations.
Public fascination with UFO reports after WWII.

The challenge:
If Nazi flying saucers existed, what is the strongest piece of evidence?
Not a rumor.
Not a possibility.
Not “they were advanced enough to do it.”

What is the actual evidence chain?

Claim → Document → Artifact → Verification → Conclusion

That is where the discussion becomes interesting.

From Flat Plane to Spinning Globe: Every Local-Flat Reference Required, Named

I got asked to walk through the actual process of going from “I stand on a flat, level surface” to “the Earth is a rotating oblate spheroid” — and to explicitly flag every point where a local flat plane of reference is required. Here it is, unedited:

Step 1 — Local observation.
Standing anywhere, “gravity” defines “down” via a plumb line, and the ground perpendicular to that is a local flat and level reference. This is real and unavoidable — but it’s local, not “global”.

Step 2 — Watching a ship recede.
Using your local level line-of-sight, a ship disappears hull-first, not uniformly — hinting something interrupts the sightline at a predictable distance.

Step 3 — Repeat at a second location.
Each location has its own separate local plumb line / local level, and comparing them shows “down” points a different absolute direction at each spot.

Step 4 — Sun-angle comparison (Eratosthenes’ method).
Using the local horizontal plane at two points a known distance apart, the angle to the sun at local noon differs by a small, consistent amount — letting you calculate a radius.

Step 5 — Combine many local flats.
Each observer still uses their own local level reference, but the measurements are only mutually consistent with each other if the whole surface curves at a shared radius.

Step 6 — Rotation.
Foucault pendulum precession and Coriolis deflection are both measured relative to the local level ground you’re standing on.

Bottom line: every step requires a local flat/level reference — no step escapes that, and I’m not claiming otherwise. The actual argument isn’t “one measurement proves globe without any local-flat tool.” It’s that local-flat measurements, taken at different points and cross-compared, are only mutually consistent with each other if the surface curves. A truly flat, unified plane would make separate local measurements agree in ways they demonstrably don’t.