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Inside the permafrost 'time tunnel' - BBC News
Below Ground in the Fairbanks Permafrost Tunnel
CRREL Permafrost Research Tunnel Virtual Tour
Permafrost Tunnel - Learning the Cold Truth
Inside the worlds only Permafrost research tunnel in Alaska | 60 Minutes Australia
Permafrost tunnel, Fairbanks, Alaska
Tunnel Man Episode 1
NASA discovers underground ‘city’ beneath ice sheet in Greenland
Unbelievable Secrets of Russia's Arctic Tunnel System | Secrets In The Ice | Science Channel
KQED Climate Watch: Inside the Permafrost Research Tunnel
Permafrost Tunnel Virtual Tour
The Permafrost Investigation
