Was the Roswell UFO a Nazi invention ? A new documentary from Germany claims that the object that crashed near Roswell was built by the Nazis. The alleged crash landing of an Unidentified Flying Object at a ranch near Roswell, New Mexico in 1947 is perhaps the best known UFO incident ever recorded. Controversy and conspiracy theories have surrounded the event for nearly 70 years with explanations ranging from an extraterrestrial vessel being shot down by the military to an innocuous weather balloon experiment. An upcoming German documentary however is set to put forward a whole new explanation to the ongoing mystery by suggesting that the object was in fact a secret Nazi flying machine. Developed by German scientists and weapons experts who defected to the US after World War II, the bell-shaped craft, alleged to be a predecessor to today's stealth fighters, was sighted by numerous witnesses including bomber crews who reported seeing 'strange machines' during the war. "I don't consider myself a crackpot or eccentric or someone given to fantasies," said German aeronautical engineer Georg Klein. "This is what I saw, with my own eyes - a Nazi UFO."