Over the years, investigations have revealed that Nazi engineers
were working on disc shaped craft, vertical take off and advanced
propulsion systems. After World War 2, the U.S. military secretly
took the designs back to the States, along with thousands of
German scientists and engineers. Two years later, in 1947 the
first wave of UFO sightings occurs across the United States and
then around the world. Could UFOs be secret U.S. aircraft
developed from captured German designs?