Researchers in a rowing boat (IMAGE) University of Helsinki Caption Mina Kiani and Olga Tammeorg are collecting sediment samples from the Lake Mustjärv to evaluate its condition after being restored through complete sediment removal. Credit Priit Tammeorg Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.