As we know, the world can't agree on ANYTHING.
So what is the true reason for the Antarctic Treaty?
The Third Reich "ends" in May of 1945.
Operation Paperclip begins 6 weeks later in August of '45. Evil Nazi scientists are brought to America and begin to infiltrate our medical and intelligence communities.
CDC established in 1946.
Roswell crash in July of 1947.
CIA and DOD are established three months later on September 18th, 1947.
Israel is formed in 1948.
Mossad established in 1949.
NSA established in 1952.
Area 51 built in 1955.
NASA established in 1958.
Operation Paperclip ends in 1959.
The Antarctic Treaty is drafted in 1959 an signed into effect in 1961.
WHAT IS HAPPENING IN ANTARCTICA?
Given they don't require everyone that works there to have top secret clearance I'm going to guess nothing top secret. And in case you doubt that, here's the sauce on a job listing for McMurdo station that specifically addresses that point.
https://jobs.parsons.com/job/14925345/construction-engineer-specialist-structural-mcmurdo-station-antarctica-centreville-va/
You don't need top secret anything if the environment is tightly controlled and isolated. And it is.
That guy thinks McMurdo station is where the real scientific mission is occurring lol.