I think"ice wall" is a not needed postulate. Past Antarctica (which let us posit is a strip of land encircling the known world which is why US government won't let anyone go there since Byrd),
PanAm flight 50 in 1977 didn't seem to have a problem with permissions, nor after flying from Cap Town over the south pole, did they find an ice wall, an infinite frozen plane or an infinite ocean, they found Auckland. The earth has been circumnavigated many times by many routes and the times and distances recorded all match the globe earth.
With all due respect, whatever that story was about PanAm is false. If you watch "Flat Earth Clues" by computer scientist Mark Sargent, it plainly states that since Admiral Byrd, nobody has been allowed to go back to Antartica. Professor Sargent feels this is due to an ice wall, which I respectfully disagree with, preferring an infinite ocean model beyond Antartica, but, either way, it is historical point of fact that Antarctica has been cordoned off since the 1950's. Any stories you hear to the contrary is social media misinformation designed to inveigle and distract from the simple fact of the matter that the US government has been in panic mode over Antarctica ever since the Byrd expeditions. Professor Sargent believes Admiral Byrd found the ice wall, I think he found more ocean, but either way, what he found does not fit the globetard model, and that is just an empirical fact of the matter.