Permafrost Expansion
Ryan James, a digging contractor, breaks through into the back of the gravel room for the first time from the new back crosscut in the Cold Regions Research and Engineering Laboratory's Permafrost Tunnel Research Facility in Fox, Alaska. The excavation was part of the phase four expansion of the permafrost tunnel, which added a new 300-foot tunnel and improved 200 feet of the pre-existing tunnel.

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Photo by: Kevin Bjella |  VIRIN: 100420-A-LI860-002.JPG