So, this thread is about whether or not the Nazis could have achieved the construction of a stronghold on the Antarctican continent, and whether or not this possible base could have survived the war...
"In 1938, Hitler sent an expedition headed by Captain Alfred Richter to the part of Antarctica just opposite the tip of South America to late a site for a base, which would be completed by 1945. In the spring of 1945, when the fall of the Third Reich was become inevitable, the untested kugelblitz, along with the engineers overseeing its construction, were loaded into serveral U-Boat submarines, and taken to this ultra-secret underground base."
The theory of a Nazi base on Antarctica has never been proven. However, there is enough evidence to suggest its presence. The Nazis certainly had an unusual high interest in the Antarctican continent. Throughout the war, man and equipment were sent to Antarctica, and the Germans mapped the continent better then anyone up until then. They renamed the whole area Queen Maude Land as Neu Schwabenland, claiming it for the Reich.
In 1943, Kriegsmarine Admiral Karl Doenitz states that "the German submarine fleet is proud of having built for the Führer in another part of the world a Shangi-La on land, an impregnable fortress..."
After the war was over, the Allies concluded over 250,000 Germans were unaccounted for - likely casualties of war included. Most of those were either scientists, engineers, of members of the SS.
Several U-Boat submarines were missing, including several of the state-of-the-art ocean-going Type XXIII U-Boats. Most notably, the U-977 and the U-530 sailed for open sea, shortly before the war officially ended. The U-977 surrendered in Argentina months later, the submarine completely empty except for its crew. The U-530 was never seen again.
Following the second world war, the United States launched Operation High Jump under command of Admiral Richard E. Byrd in 1947, the world on the brink of the Cold War. The expedition consisted of thirtheen ships, two seaplane tenders, an aircraft carrier, twelve other aircraft, six helicopters, and a force of 4000 men. Its cover mission was that of mapping the entire Antarctic coastline, of which they took 70,000 aerial photographs.
The expedition dicovered an area free of ice that contained unusually coloured lakes, that they called an oasis. A sample of the lake was was obtained and on analysis it was found that the water was brackish, indicating that the lakes were connected to the sea.
An operation that had been planned to last for several months was cut short after a few weeks. The fleet limped home as if defeated, and the local South American press wrote of such defeat. According to the newspaper Brisant, Byrd reportedly told a reporter:
"...it was necessary for the USA to take defensive actions against enemy air fighters which come for the polar regions..." and that in case of a new war "...the United States would be attacked by fighters that are able to fly from one pole to the other with incredible speed."