I have an uncle who went to Antarctica to help film a documentary on penguins and how their environment is changing. They went directly South and reached Antarctica. No government ships or guards or masked men with guns. They also passed by the Transantarctic mountain range, and some of his group traveled to the geographic South Pole and the US Amundsen-Scott South Pole Station. They departed from the South American side and reached the Australian side of Antarctica. He came back with the footage on schedule. Wasn't brainwashed nor was there a computer chip implanted in his teeth. He didn't see any other mountain ranges besides the Transantarctic, and when he passed thru it he did not find the edge of the world. Darn.
Please tell me your spin on this
Sorry about all the trolls. I don't dispute that your Uncle's team went to Antarctica - Antarctica's a big place. Unfortunately, they were most likely not at the actual South Pole, since the Ice Wall is located there.
Of course, your uncle could report a few simple observations from the coast of Antarctica that would prove very difficult for FE to explain.
For example, he probably saw the Sun, stars, or both to the south of his position. If he saw the Sun, he'd report that it was the same apparent size as any other time he has seen it.
If he saw the Southern Star high in the sky, that would be very difficult for FE to explain.
If he traveled to a number of places along various longitudes, his report that the southern constellations remain to the south despite the difference in longitudes.