You believe the Earth to be an Infinite Plane, correct? Do you have any speculation as to what might lie beyond Antarctica? Another curious question: How is it no one's gone to find out?
I suspect that it might be, but I can't explain why. Strange that something finite should be harder to grasp than something infinite, but there it is.
As for speculation as to what lies beyond antarctica, it's anyone's guess. I have my theories as to the nature of the planar earth, and to be honest I'm making an effort to stay out of the realm of the theoretical for a while, but since you asked, I'll answer.
One possible scenario, among many (to be taken with a grain of salt): It's long been an argument from round earth thinkers that there is spatial distortion in the southern hemiplane of our flat earth map. I've asked myself, "Well, what if they're right, and there literally
are spatial distortions?" This was a thought experiment I put together, in which the spatial dimensions themselves decompress as we get closer to the southern polar rim. In this case, it may be physically impossible to venture too far out into the antarctic plane as the spatial dimensions get increasingly distorted. Expeditions "across" antarctica that have happened in the past can easily be mapped as a simple journey around the rim, and it seems like something forces these expeditions to turn around and begin heading north again. Spatial distortion could account for this behavior, and in regards to the infinite plane, as spatial relationships get may get stretched out ever more, increasing exponentially the farther out you go beyond the pole, infinity (paradoxically) may not be very far.
But - that's all purely hypothetical, not to mention rather esoteric, and isn't good for much but rhetoric. As I mentioned before, I'm making an effort not to dwell in the theoretical overmuch, and to focus on the zetetic disciplines that led me to belief in a flat earth to begin with. These ideas are fun to think about, but that's about it for me. All I know for sure is that I don't know what's out there.