Ice-Penetrating Radar (IMAGE) University of Washington Caption The equipment used to map ice layers consists of a snowmobile (left) that tows a sled with an ice-penetrating radar. Credit Nicholas Holschuh/University of Washington Usage Restrictions With credit 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.