A new deep-sea bacterium called Pseudodesulfovibrio cashew was discovered, which helps remove heavy metals from the environment by forming insoluble metal sulfides. This bacterium is a type of sulfate-reducing bacteria that plays a key role in the sulfur cycle in marine sediments. It was found in a unique environment called a deep-sea cold seep. The bacterium has the ability to resist and remove various heavy metal ions like iron, cobalt, nickel, copper, cadmium, and mercury. This discovery sheds light on how bacteria in the deep sea can help clean up heavy metal pollution and contribute to the sulfur cycle in marine ecosystems.