Their source of power was the Black Sun, an infinite beam of light which, though invisible to the human eye, exists in anti-matter.
The Vril emblem became the Black Sun, a secret philosophy thousand of years old provided the foundation on which the occult practioners of the Third Reich would later build. The Black Sun symbol can be found in many Babylonian and Assyrian places of worship. They depicted the Black Sun - the godhead's inner light in the form of a cross. This was not much different from the German's Knight's Cross.
The woman allegedly channeled information from aliens after which the Thule was created. they went on to build something called the Vril Machine. It allegedly was a saucer shape interdimensional time travel machine. Their first flight was allegedly in 1934.
Much of there work was carried out in the Black Forest
Thule Society members were allegedly the first group to attempt the back-engineering of an extraterrestrial spacecraft. "A German writer, John Von Helsing, describes the discovery of a crashed saucer in the Black Forest in 1936 and says that this technology was taken and combined with the information the Vril Society had received through channeling and was made into a further project called the Haunebu.
German aircraft historian Henry Stevens states, "Haunebu 1 was allegedly the first large flying saucer developed in Germany. According to plans allegedly obtained from classified German SS files, the Haunebu 1 was approximately seventy-five feet in diameter and probably lifted off for the first time in August 1939, a few weeks before the outbreak of World War II.
Source: UFO Sightings