Analysis
Deep-sea mining’s first real test is happening now
A pilot operation is collecting metal-rich nodules from the Pacific seabed. Scientists on board are measuring what it leaves behind.
Science correspondent
12 min read
The Pacific abyssal plain, 4,000 metres below the surface.
Four kilometres below the surface of the Pacific, a machine the size of a tractor is crawling across the seabed, vacuuming up potato-sized rocks rich in cobalt, nickel and manganese.
On the ship above, independent scientists are measuring the sediment plume it creates, and how far it travels.
What is at stake
The nodules contain metals used in batteries. Supporters argue deep-sea mining could reduce pressure on land-based mines. Opponents say we know too little about deep-sea ecosystems to risk destroying them.
“We are measuring the damage of something that has never been done before, while it is being done,” one of the scientists said.
The decision ahead
The International Seabed Authority is expected to decide on commercial rules within two years. The data from this pilot may be the most important evidence it receives.
Leo Hartmann
Science correspondent
Leo writes about research, researchers and the long road from lab to headline.
