Gas Hydrate Mounds in Arctic Ocean (image) CAGE - Center for Arctic Gas Hydrate, Climate and Environment Share Print E-Mail Caption Gas hydrates are formed under cold temperature and high pressure conditions beneath the ocean floor. They contain large amounts of greenhouse gas methane. Credit CAGE Usage Restrictions None 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.