Is water at the bottom of the ocean clean?

Water at the bottom of the ocean is generally considered to be cleaner than surface water, as it is less exposed to pollutants and human activities. However, it can still contain contaminants from natural sources, like minerals and organic matter, as well as pollutants that have sunk from the surface. Additionally, deep-sea environments can be affected by deep-sea mining, oil spills, and other human impacts. Overall, while it may be relatively clean, it is not entirely free from contamination.