From Wikipedia...
The Thule Society (German: Thule-Gesellschaft), originally the Studiengruppe für germanisches Altertum 'Study Group for Germanic Antiquity', was a German occultist and völkisch group in Munich, named after a mythical northern country from Greek legend. The Society is notable chiefly as the organization that sponsored the Deutsche Arbeiterpartei, which was later transformed by Adolf Hitler into the Nazi Party. Hitler, however, was never a member of the Thule Society, in spite of allegations about his occult initiation in Nazi-occult literature.
A 1967 book by Louis Pauwels and Jacques Bergier made many spectacular claims about the Vril Society of Berlin. Several later writers, including Jan van Helsing, Norbert-Jürgen Ratthofer, and Vladimir Terziski, have built on their work, connecting the Vril Society with UFOs. Among their claims, they write that the society had made contact with an alien race and dedicated itself to creating spacecraft to reach the aliens. In partnership with the Thule Society and the Nazi Party, it developed a series of flying disc prototypes. With the Nazi defeat, the society allegedly retreated to a base in Antarctica and vanished.
Terziski, a Bulgarian engineer who bills himself as president of the American Academy of Dissident Sciences, claims that the Germans collaborated in their advanced craft research with Axis powers Italy and Japan, and continued their space effort after the war from New Swabia. He writes that Germans landed on the Moon as early as 1942 and established an underground base there. When Russians and Americans secretly landed on the moon in the 1950s, says Terziski, they stayed at this still-operating base. According to Terziski, "there is atmosphere, water and vegetation on the Moon," which NASA conceals to exclude the third world from moon exploration. Terziski has been accused of fabricating his video and photographic evidence.