Improving Paleotemperature Reconstruction (IMAGE) University of Basel Caption The researchers filtered hundreds of liters of water from Lake Lugano at depths of up to 275 m using a battery-operated in-situ pump. Credit University of Basel, Department of Environmental Sciences Usage Restrictions Please use proper credit line 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.