The Sandpit has derka derkas because despite how inhospitable it is, it is still inhabitable. Antarctica is not inhabitable. Not without massive amounts of startup funds and a constant supply of warmland supplies.
Ergo, unless something really drastic happens to the climate, we will never see antarctic nomads blowing up convoys of american snowmobiles with IEDs. We could have people raiding and squatting in abandoned bases, but they won't really have the power to stand against any of the warring empires and since they can't just take to the wilderness they'd have to behave themselves lest they get sieged.