Carbonate chimneys in the Black Sea grow close to each other and can vary in size. They can reach heights of several meters - like this one at 2.5 m high. Many of them emit bubbles of methane gas, which provides the energy source for the microbes that formed this chimney.
Video footage taken by ROV Quest during the MICROHAB cruise aboard RV Meteor, 2007. Copyright MARUM/Max-Planck-Institute for Marine Microbiology Microhab METEOR M72/2.
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