Helium Levels in Groundwater (IMAGE) University of Tokyo Caption Locations with high levels of stress exertion exhibited high levels of helium release, while locations with low levels of stress exertion exhibited low levels of helium release, thereby demonstrating a positive correlation. Credit 2016 Yuji Sano. Usage Restrictions Please use image only in relation to press release. 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.