Ice Core Drilling (IMAGE) Desert Research Institute Caption A shallow firn core was drilled during the Norwegian-American Scientific Traverse of East Antarctica. Credit Stein Tronstad Usage Restrictions No restrictions. Additional illustrations and images are available upon request. 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.