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Deep-Sea Riches: Mining a Remote Ecosystem

by Sabrina Imbler and Jonathan Corum
August 29, 2022
in World
Reading Time: 7 mins read
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In the present day, billions of tons of those nodules cowl huge swaths of the ocean flooring, a number of miles beneath the floor.

A nodule discipline within the Clarion-Clipperton Zone.GEOMAR

One of many largest areas is the Clarion-Clipperton Zone, which covers 1.7 million miles of the Pacific seabed and holds huge fields of nodules.






Territorial waters,

200 nautical miles

from shore

Territorial waters,

200 nautical miles

from shore

Territorial waters,

200 nautical miles

from shore


Supply: Worldwide Seabed Authority

Life Among the many Nodules

Polymetallic nodules are an anchor for a fragile and slow-growing ecosystem that features species discovered nowhere else on Earth.

For creatures that can’t simply swim, nodules are islands to decide on and construct a life. The muddy seafloor is just too tender to be a house for them.

Glass sponges are the commonest sponges within the Clarion-Clipperton Zone. They’ll stay for 1000’s of years and supply vital habitats for different creatures. They’re dwelling archives, recording the traditional local weather of the deep sea of their skeletons, like tree rings.

A number of glass sponges develop on prime of each other, together with a brown vase-like sponge within the genus Oopsacas and a white sponge within the household Euplectellidae.GEOMAR

Different species float and swim over the nodule fields.

An unidentified species of jellyfish.GEOMAR

This rippling squidworm — which is a worm, not a squid — hovers over the nodules, settling solely to feed.

A squidworm makes use of its tentacle-like appendages to gather marine snow, natural particles falling from the higher ocean.Craig Smith, DeepCCZ Mission

Carnivorous sponges tethered to nodules snare small crustaceans scuttling close by.

Two carnivorous sponges. On the left, a species within the genus Cladorhiza. On the fitting, a ping-pong tree sponge within the genus Chondrocladia, which makes use of hooks to seize its prey.Craig Smith, DeepCCZ Mission

Some creatures even stay in crevices within the nodules, comparable to this pearlescent worm.


Photograph of a polychaete worm living in a nodule crevice.


A worm burrowed in a nodule.A.G. Glover, H. Wiklund, T.G. Dahlgren, M.J. Brasier

Lots of the species found to this point within the Clarion-Clipperton Zone are discovered solely on the nodules themselves. If the nodules go, they’ll, too.


Photograph of a polychaete worm.


The polychaete worm Neanthes goodayi, new to science, lives among the many nodules.A.G. Glover, H. Wiklund, T.G. Dahlgren, M.J. Brasier

Harvesting Nodules

Mining corporations describe the nodules as a “battery in a rock” as a result of they include the important metals for a clear power economic system that’s depending on batteries and electrical automobiles.

The Clarion-Clipperton Zone lies in worldwide waters and is overseen by the Worldwide Seabed Authority. Giant areas have been put aside for various international locations to mine, however industrial mining has not but begun.

Two deep-sea species of sea cucumber, one sitting and one swimming.GEOMAR

The precise mining is simple: Dredge or vacuum the nodules up from the muddy sediment. However eradicating nodules destroys all the pieces that lives on them.

Scientists accumulating a pattern of the black coral Antipatharia.GEOMAR

Mining the seafloor additionally stirs up gritty plumes that may journey so far as 5 miles. These sediment clouds can bury fields of nodules, choke the filters of sponges and anemones dwelling exterior the mining zone and obscure bioluminescence that squid and fish use to hunt and mate.

A cloud of nice sediment billowing from the seafloor, attributable to a remotely operated automobile. A mining head — many instances bigger and sooner — might make a bigger cloud. (Engineers are searching for methods to restrict the scale of the plumes.)Craig Smith, DeepCCZ Mission

With out nodules, many of those species won’t be able to resettle the disturbed seafloor. And with little or no pure water motion this deep, dredging scars can persist for many years.

A Dumbo octopus floats over a gouge within the seafloor.GEOMAR

After eight months, the perimeters and grooves of a Belgian dredging scar are nonetheless sharp.

The Belgian space of the Clarion-Clipperton Zone.ROV Group Kiel 6000, GEOMAR

After 37 years, a French dredging scar is softened however nonetheless naked.

The French part of the Clarion-Clipperton Zone.GEOMAR

Dividing the Seafloor

The Clarion-Clipperton Zone is at present divided into 16 exploration areas managed by totally different international locations, together with areas reserved for a few of the world’s much less developed nations. Different exploration areas have been designated within the Atlantic Ocean and the western Pacific.

Researchers decrease a automobile to review the seafloor.GEOMAR

The metals present in nodules will be mined from land, however a few of these mines are riddled with human-rights abuses. Terrestrial mining additionally carries a heavy environmental price: clearing forests, contaminating air, polluting water and threatening biodiversity.

Deep-sea mining of the world’s largest habitat — and the little-known species that inhabit it — could start in earnest as early as 2024.



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Tags: DeepSeaecosystemMiningremoteRiches
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