Permafrost Research (IMAGE) University of Delaware Caption University of Delaware researchers observe permafrost layers in a trench, with the Alaska Pipeline in the background. Credit University of Delaware Usage Restrictions Image must include credit to University of Delaware. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.