Polymetallic nodules are small, round mineral deposits found on the ocean floor, primarily in deep-sea environments. They are composed mainly of manganese, nickel, copper, and cobalt, which are valuable metals used in various industries, including electronics and renewable energy. These nodules form over millions of years through the accumulation of minerals from seawater and sediment. They are typically found in areas like the Clarion-Clipperton Zone in the Pacific Ocean, where they can cover large expanses of the seabed. Their extraction is a topic of interest due to potential economic benefits and environmental concerns.