Near the end of World War 2 when the Germans were working on their super weapons and the Allies cut off the Axis supply lines of highly sought after scientific and industrial equipment the German high command decided to retreat into their secret virtually unconquerable bunker hidden deep beneath thick layers of ice in Antarctica for what was known as Operation Highjump and this was a continuation of Project Paperclip.
Admiral Richard E. Byrd led 4,000 military troops from the U.S., Britain and Australia in an invasion of Antarctica called “Operation Highjump” in 1947 in a cleanup operation to try and ferret out the remaining German officers who had escaped judgement of the Nuremberg trials.
One day I'd like to do a series of posts on this subject - it's one of the most amazing true stories in the modern day history and also of intelligence agencies of long ago and what they were up to then. Secrets, even classified top secret military info, eventually do become revealed and come out into the light of day.
Below are some historical pictures of the submarine maps that the commanders got to retreat to underground cavern where the Germans had previously made contact with an inner earth civilisation inhabiting earth to this very day and are rumored to created a breakaway civilisation which could even setup colonies on other planets and moons in our solar system and beyond.
Here is an Antarctic Map to Asgard.
An Inner Earth hemisphere map.
Here is a German letter that has been discovered detailing communications with various members of the Nazi party.
More detailed maps.
Reference Sources
The Dark Web and other advanced search queries for keywords documents.
http://humansarefree.com/2015/07/nazi-maps-and-documents-to-agartha.html
https://www.bibliotecapleyades.net/antarctica/antarctica_operationhighjump.htm#inicio
https://www.gaia.com/lp/content/hollow-earth-theory-is-the-subterranean-civilization-of-agartha-real/