Permafrost Tunnel in Alaska (IMAGE)

NASA/Goddard Space Flight Center

Permafrost Tunnel in Alaska

Caption

The Permafrost Tunnel north of Fairbanks, Alaska, was dug in the 1960s and is run by the U.S. Army’s Cold Regions Research and Engineering Laboratory. It is the site of much research into permafrost — ground that stays frozen throughout the year, for multiple years.

Credit

NASA/Kate Ramsayer

Usage Restrictions

No restrictions.

License

Public Domain

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