It seems that the U.N and NASA are the modern day guardians of the conspiracy to prevent the flatness of the Earth from getting out. Neither of those organizations are even a hundred years old yet. Who guarded the conspiracy before the U.N. and NASA?
And just how would the U.N prevent someone from exploring Antarctica? They'd have to patrol 65,000+ miles of ocean to prevent it. Just how is that accomplished?
Also, there's a big problem with the flat-earther map. The further you get from the center of the flat-earther map, the more the distances are stretched away from reality and yet flat-earthers claim that the distances are the same - but there's just no way that they can be. The real distance between the east and west coast of Australia is about 2300 miles but would be more like 5500 (more than twice as far) on the flat-earther disk version of the planet. This assumes that distances from the north pole (i.e. center) remain the same on both models. The distance cannot be both 2300 miles and 5500 miles. Only one of them is right and the other disproves their respective model. Guess which is which?
These and other arguments are presented (somewhat rudely) in the following video...
https://www.youtube.com/watch?v=JgY8zNZ35uw