Drillers at Work (IMAGE) University of Nebraska-Lincoln Caption WISSARD drillers set in place an ultraviolet light collar, used for purification, at the borehole site near the Whillans Ice Stream grounding zone in Antarctica. Credit Frank Rack, UNL Science Management Office Usage Restrictions None 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.