How deep is the permafrost in the Antarctic? I tried in vain to find the answer to this question on the web, but all it would tell me was, "it is very deep", and "it is known as a thaw line rather than a frost line in the arctic and antarctic". How far down you would have to live to escape the permafrost? 100 ft? 1000 ft? 10000 ft?. How feasible would an underground base be?
According to "Permafrost, active-layer dynamics and periglacial environments of continental Antarctica" South African Journal of Science 98. pages 82-90:

Only 25% of Antarctica has permafrost, as the material beneath thick ice sheets is not permafrost. 

The deepest permafrost occurs where there is no ice sheet. 

The deepest permafrost in the Antarctic is about 1000m.