Poly Metallic Nodules in the Deep Ocean

Poly metallic nodules are like concretions of metal that are strewn across ocean floor. They contain cobalt, which is probably the most rare or resource limited element we need for our current lithiumiand battery technoledge. But again, these there's so much of it there that it would be a long time before we would significantly alter the concentration. We can totallytatthat we really need, probably is not necessary for the for ocean life.