Marginal Ice Zone project (IMAGE) University of Washington Caption A cartoon of sensors now installed in the Arctic Ocean. Weather stations (green) sit on the ice. Ice-tethered buoys (yellow boxes) take measurements under the ice. Wave sensors (red) sit on the ice and in open water. Swimming robots (yellow) can travel in open water and below the ice, where they navigate using sound sources (gray boxes). Credit UW Applied Physics Laboratory Usage Restrictions With credit 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.