I've been advocating a similar model for a while, there's no reason to believe that space is just a plain Euclidean environment, even RET doesn't believe that. There is absolutely no reason for there to not be any thinner areas that connect one side to another, and in line with this there's no reason to think this edge is in Antarctica when it could be a location more regularly traversed. If it is possible to travel in such a way, which it certainly is, light and air and everything would 'loop' around, though in truth it's not like anything special happens. It is travel through space, just as you travel anywhere else. In truth it follows simply from the notion of space possessing a concentration.
If you want to support such a model, I propose the transition be at the equator rather than Antarctica. It explains a number of phenomenon that way.