Polarstern (IMAGE) Helmholtz Association Caption Polarstern measures ice-thickness, station work in the foreground. Credit Stefan Hendricks, Alfred Wegener Institute Usage Restrictions Terms of use: http://www.awi.de/en/news/images_video_audio/terms_of_use/ 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.