Which organisms can live in the hydrogen sulfide zone of the Black Sea?

The hydrogen sulfide zone of the Black Sea is characterized by a lack of oxygen, which renders the environment largely lifeless. While this deep-water region is often described as a "dead" zone, it is not entirely devoid of biological activity; it is inhabited by specialized bacteria that have adapted to these anaerobic conditions. Aside from these specific microorganisms, the zone is considered biologically lifeless.123