Right now, in the Pacific Ocean, billions of potato-sized rocks are scattered across the ocean floor. These lumpy, ugly-looking rocks -- also called polymetallic nodules -- contain critical metals that are becoming increasingly difficult to source and mine on land, including nickel, copper, cobalt, and manganese. Nobody can mine these nodules right now; nobody, indeed, has the legal right to commercialize them. TMC The Metals Company (TMC +0.87%), however, is trying to become the first. If it does get the r ...