Tunguska-3 (IMAGE) Helmholtz Association Caption Sampling -- cutting peat profiles in the permafrost area of Tunguska Credit Photo: Evgeniy M. Kolesnikov, Lomonosov Moscow State University 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.