The fact is that there was plenty of evidence, at the time, to indicate that as late as 1947, elements of the Kriegsmarine, or German Navy, were still very much active in the South Atlantic, operating either out of South America, or some base, previously unsuspected, in the Antarctic. Many stories were circulating at the time…
USS Sennet 1946 Operation HighJump
Upon the Navy’s return, all information was classified ‘top-secret’, and the only person to being talking about the mission, the Secretary of the Navy James Forrestal, was quickly institutionalized in Bethesda Naval Hospital psychiatric ward, and later died from a suspicious suicide.
The Nazi’s embraced the occult and believed that the earth could be hollow, they also believed that hollow center could be inhabited by aliens. In fact they believed this so much that one of their missions was specifically designed to find an entrance to the earths interior and make contact with the inhabitants for support in the war, should they be located.
And the UFO base?