I've seen a lot of round earthers talk about how clear proofs that the world is flat, such as the bedford level experiment, or cases where the light of a light house was visible when it should be blocked by the Earth's curvature, or situations where more of the world over a lake could be seen than should be possible on a round Earth, are unreliable given they have only been performed a handful of times.
If this is so, why do you claim, Antarctica is not a ring?
Who has crossed it? Amundsen is said to, though he only went to a certain magnetically interesting point. Scott was said to, but all of his expedition died. Shackleton failed. Mackintosh's whole expedition died. Primarily, all anyone does is map the coast, which is possible on a ring.
Anyone who tries to actually cross Antarctica dies, with no survivors. Scott, Mackintosh... Only Wilkins and Fuchs can really be said to have crossed Antarctica, and are contradicted by the likes of Ronne who claim they observed no sea on the far side.
You have at best two out of numerous attempts to cross Antarctica. Why is that rare event given more credence than the multitude of experiments that prove the Earth is flat?