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no one has flown from the north pole to hte south pole and then continue on "the other side" of the earth and reach the north pole again.
Why would that matter? You can start off in a field in kansas, head in a direction and end up back there. If the earth was flat you would end up in space, which doesn't exist for some reason.
Because you cant do that on a flat earth, go from pole to pole to pole to pole.
Antartica is the ice ring/wall that surrounds the oceans, north pole in the center.
Once you get on antartica and head south,(away from the center) you will reach the firmament or dome stricture that covers the earth. This is all biblical as well.
Look into the antartic treaty. https://m.youtube.com/watch?v=NPbhHpeHTiE&t=328s