Gary Larson Gary Larson, facility operations manager with the Cold Regions Research and Engineering Laboratory, points out green grass in permafrost that is older than 10,000 years during a tour of the Army Corps of Engineers Permafrost Tunnel Sept. 12, 2019. The only one of its kind, the permafrost tunnel allows for research on permafrost and how it affects climate change. SHARE IMAGE: Download Image: Full Size (0.39 MB) Photo By: Daniel Nelson, Army VIRIN: 190912-A-ZW424-1021.JPG Photo Gallery