Lake Mercer Camp Drone (IMAGE) University of South Florida Caption Drone view of the historic expedition from December 2018 to January 2019, when researchers accessed a subglacial lake for only the second time in history and retrieved the longest sediment core from a subglacial lake. Credit Billy Collins Usage Restrictions NA 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.