Permafrost Expansion
CRREL technician Kate Liddle-Broberg and contractor Ken Robbins finish marking the mining face for excavation control of the Engineer Cold Regions Research and Engineering Laboratory's Permafrost Tunnel Research Facility in Fox, Alaska, as part of the phase four expansion of the permafrost tunnel, which excavated a 300 foot tunnel and improved 200 feet of pre-existing tunnel.

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Photo by: Kevin Bjella |  VIRIN: 100420-A-LI860-005.JPG