As is fairly well-known, a substantial part of the Nazi war effort was based on the purely mystical belief that magical assistance would ultimately come to the aid of the Germans, from either a lost super-race (said to be living in the center of the Earth) or the old Teutonic gods.

This page details one Nazi expedition to Tibet that was sent in search of Thule, the legendary homeland of the Aryan race, rumored to be living underground in the Hollow Earth.

Thank God Indiana Jones was there to stop them.