Something going on in Antarctica. Byrd goes down there several times including taking a carrier group in 1947. Comes back saying it's a treasure trove of resources. Coal, plutonium, oil etc. Also saying it's the most important scientific area in the world. Paraphrasing but it was something like that. Not long after the area is locked down by a treaty of 50 plus nations. No one can go there. At least travel the interior. Strange. With all that money sitting there no one has tapped it yet? Not like there were environmentalists back then to ban industry from operating there. Anyway, whether Byrd found aliens, some wild archaeological find or even some life changing geographical discovery like a edge? Who knows but they sure do like to keep it off limits.
Admiral Byrd interview