Glider robots (IMAGE) University of Gothenburg Caption An underwater robot, known as a glider, allowed the researchers to measure methane concentrations in the waters around the Nord stream spill. Credit Aleksandra Mazur/VOTO 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.