The National Socialist Party, Notes in the Hollow Earth

Talks about the idea that there is a civilization below the crust of the earth. Factions of the national socialist party had an intense belief in the occult. Government financed quests to find hidden mystical lands like chambela a shangela and, in the case of antarctica, an entrance to the underworld. But as we as we learn, no one found any entrance. And that's not to say there's not an extensive, possible cave system in antarctic.