Permafrost Tunnel Research Facility - PTRF 

Permafrost - ice wedges - ice lenses - other permafrost features - bones from the Pleistocene Epoch: bison, mammoth, horse...

Excavated from 1963–1969 for the study of permafrost, geology, ice science, and mining and construction techniques specific to permafrost environments, the PTRF is one of the the U.S. Army Corps of Engineers and the nation's unique, natural research facilities.

The Cold Regions Research and Engineering Laboratory operates, maintains and provides research at this field site for the nation and the world as part of its mission for the U.S. Army Engineer Research and Development Center.

The PTRF in Fox, Alaska 
is available for scientific research projects studying a frozen environment over 40,000 years old 
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