Pressure is on to start mining the deep sea. Is it worth it?

Pressure is on to start mining the deep sea. Is it worth it?

A sea cucumber is seen on the deep ocean floor in the Clarion-Clipperton Zone, an area of the Pacific Ocean where mining companies want to exploit polymetallic nodules rich in cobalt, nickel, copper and manganese. (Diva Amon and Craig Smith/Abyssal Baseline Project)...