Craters Seeping Gas (IMAGE) UiT The Arctic University of Norway Caption The massive craters were formed around 12,000 years ago, but are still seeping methane and other gases. Credit Illustration: Andreia Plaza Faverola/CAGE Usage Restrictions Attribution 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.