Crevasse (IMAGE) NASA/Goddard Space Flight Center Caption A view of the crevasse field downstream of the section of the firn aquifer that Kristin Poinar studied. Water is not visible in the crevasses, because meltwater doesn't enter them until about 40 feet below the surface, where the firn aquifer lies. Credit Clement Miège, University of Utah 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.