It goes very far down. Permafrost or permafrost soil can exist with ice on top of it or not. There is an active layer of .6 to 4 meter that seasonally changes and can sometimes support life, but permafrost goes down as far as 1,493 meters in the deepest areas in Siberia.
Permafrost soil, defined as soil kept at a temperature lower than the freezing point of water for a time period exceeding two years, is most common at high altitudes, especially in proximity to the North and South poles.
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