The dive under Dotson (IMAGE) University of Gothenburg Caption The autonomous underwater vehicle Ran was programmed to perform missions under the ice shelf. An advanced multibeam sonar system was used to map the underside of the ice at a distance of about 50 metres. Credit Illustration: Anna Wåhlin/Science Advances Usage Restrictions None License Original 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.