"Great White Brotherhood: a mythical extraterrestrial society that would inhabit an underground kingdom of ancient origin and of mysterious nature, different from the surface.
The Great White Brotherhood is a set of alien beings superior in level of consciousness (also called “Ascended Masters”)."
https://www.soulask.com/great-white-brotherhood-ascended-masters-of-the-underworld/
"The “Great White Brotherhood” is the Guardian of Ideas. The Gods have invoked the Brotherhood of Agartha – The Order of Thule, and other Magic Systems work in the Construction of the new Eon. Hope is our Principle."
https://robscholtemuseum.nl/wes-penre-thule-gesellschaft-and-the-vril-society-funkenfilme-exemtum/
"the Imperial Germans from the Inner World of Agartha"
http://imperialgermans.com/dayx.html