Hitler fantasised about creating a fleet of flying saucers capable of destroying London and New York as his armies retreated on all fronts.
New movie Iron Sky, due out next year, tells the story of Nazis escaping to the moon to regroup for a new attempt at world domination.
But after trawling through top secret Nazi archives, The Sun can reveal the truth about Hitler's UFOs is far more chilling.
One alleged site of production of the Nazi UFOs is a series of tunnels buried under the Jonas Valley in Thuringia, central Germany.
Here, under the command of SS General Hans Kammler, legions of slave labourers worked to bring the Fuhrer's fantasies into existence.
The respected German science mag PM has reported how "advanced" the programme was as scientists toiled in secret factories to produce the "wonder weapon" to win the war.
The magazine quotes eyewitnesses who saw a flying saucer marked with the German Iron Cross flying low over the Thames in 1944. "America also treated the existence of the weapons seriously," it said.To read the rest of the article, click here.