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Low Ceiling CRREL Permafrost Tunnel (27 March 09 12:02)
Alaska

The permafrost tunnel has two branches -- this is the deeper one with lower ceiling.  Here you can see a large ice wedge cutting across the tunnel's width.

Copyright: Matt Nolan
Type: Spherical
Resolution: 12520x6260
Taken: 28/03/2009
Chargée: 28/03/2009
Mis à jour: 27/08/2014
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Tags: crrel; permafrost tunnel; permafrost; ice wedge
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More About Alaska

Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait. Approximately half of Alaska's 710,231 residents (as per the 2010 United States Census) live within the Anchorage metropolitan area. Alaska is the least densely populated state of the U.S.Source: http://en.wikipedia.org/wiki/Alaska