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The United States Army maintains and operates a unique research facility near Fairbanks, Alaska, known as the CRREL Permafrost Tunnel. CRREL is short for the U.S. Army's Cold Regions Research and Engineering Laboratory, part of the U.S. Army Corps of Engineers Engineer Research and Development Center. The Permafrost Tunnel was excavated into a man-made escarpment, and is approximately 110 meters in length, 2 to 2.5 meters high, 4 to 5 meters wide...(more)
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CRREL Permafrost Tunnel -- 15m into adit


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CRREL Permafrost Tunnel, 15 m into the adit.  This is the entrance to the tunnel.  Several ancient bones can be found emerging from the walls here.