Arctic Ocean Echo Sounder (video) CAGE - Center for Arctic Gas Hydrate, Climate and Environment Share Print E-Mail Loading video... Caption The methane is released as bubbles which can be seen as flares in echo sounder surveys. Here is an example of a marked difference between flares observed in winter (May) and Summer (August). C Credit B. Ferré/CAGE, UiT Usage Restrictions CC BY Share Print E-Mail 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.