Mud volcano at seafloor (IMAGE) Marine Biological Laboratory Caption A mud volcano at the seafloor where methane-rich fluids from the subsurface are emitted to the water column. These ecosystems are at the interface between the subsurface and surface realms and are often oases of life in the deep ocean. Credit Mandy Joye/UGA Usage Restrictions Use with credit License Original 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.