Operation Highjump — Antarctica & the Antarctic Treaty

In August 1946, the US Navy launched Operation Highjump — the largest Antarctic expedition in history. 4,700 men, 13 ships, 33 aircraft, led by Rear Admiral Richard Byrd. Officially to 'establish the Antarctic research base Little America IV' and train for cold-weather operations. The expedition was planned for 6-8 months but was abruptly terminated after only 8 weeks. Admiral Byrd gave a cryptic interview to Chilean newspaper El Mercurio stating the US would need to defend against 'fighters that could fly from pole to pole at tremendous speeds.' In 1938, Nazi Germany had already explored the region (Neuschwabenland) and allegedly established 'Base 211.' In 1959 — just 12 years after Highjump's abrupt end — the Antarctic Treaty was signed by 12 nations, designating Antarctica as a scientific preserve, banning military activity, restricting civilian access beyond 60 degrees south, and effectively making it the most restricted continent on Earth. No independent territorial claims are recognized. No mineral exploitation allowed. Access requires permits. The treaty that restricts all of humanity from freely accessing an entire continent was signed in the middle of the Cold War by nations that agreed on nothing else. What prompted 12 competing nations — including the US and Soviet Union — to jointly lock down an entire continent during the height of the Cold War?