I came across an interesting article in Wired Magazine recently, The Mining Industry’s Next Frontier Is Deep, Deep Under the Sea | WIRED. The article was about polymetallic nodules. I had not previously been aware of these nodules.
"...One March day in 1873, some of these subaqueous artifacts were dragged for the first time into sunlight. Sailors aboard the HMS Challenger, a former British warship retrofitted into a floating research lab, dredged a net along the sea bottom, hauled it up, and dumped the dripping sediment onto the wooden deck. As the expedition’s scientists, in long trousers and shirtsleeves, eagerly sifted through the mud and muck, they noted the many “peculiar black oval bodies” that they soon determined were concretions of valuable minerals. A fascinating discovery, but it would be almost a century before the world began to dream of exploiting these stones."
