From the BBC:
Historians working in Germany and the US claim to have found a 60-year-old diagram showing a Nazi nuclear bomb.
It is the only known drawing of a “nuke” made by Nazi experts and appears in a report held by a private archive.
The researchers who brought it to light say the drawing is a rough schematic and does not imply the Nazis built, or were close to building, an atomic bomb.
But a detail in the report hints some Nazi scientists may have been closer to that goal than was previously believed.
More here. [Thanks to Alan Koenig.]