Now, companies and governments are preparing to extract valuable minerals from the seabed. The potential rewards are enormous. So are the risks. Could humanity be about to destroy one of Earth's last great wildernesses in pursuit of the materials needed to power its technological future?
An industrial revolution beneath the waves
Imagine an industrial mining operation taking place more than four kilometres beneath the ocean surface. There is no sunlight. Temperatures are close to freezing. The pressure is hundreds of times greater than at sea level.
Yet, scattered across the vast darkness of the seabed, lie millions of mineral-rich rocks containing metals increasingly important to modern civilisation.
These are polymetallic nodules.
They can contain manganese, nickel, copper and cobalt, among other elements used in batteries, electrical infrastructure, renewable energy technologies and industrial manufacturing.
For decades, these unusual geological formations have attracted the attention of mining companies, scientists and governments.
Now, advances in underwater robotics, deep-sea engineering and mineral processing are bringing commercial extraction closer to reality.
The argument in favour is straightforward: the world needs more critical minerals, and the ocean floor could provide access to enormous quantities of them.
But there is a fundamental problem. We still know remarkably little about the ecosystems surrounding these mineral deposits. And some of the most important scientific findings suggest that disturbing the seabed could have consequences lasting for generations, potentially much longer.
What exactly is down there?
The deep ocean is not one uniform environment. It contains a remarkable variety of habitats, each with different geological characteristics and biological communities.
Deep-sea mining proposals generally concern three major types of mineral deposit.
1. Polymetallic nodules
These are potato-sized, sometimes larger, mineral formations found resting on the sediment of deep ocean plains. They form extremely slowly as metals accumulate around small nuclei over geological timescales.
Some deposits are estimated to have taken millions of years to develop.
Their composition varies, but they can contain commercially valuable concentrations of:
- Manganese
- Nickel
- Copper
- Cobalt
- Iron
One of the most significant locations is the Clarion-Clipperton Zone, an enormous region of the Pacific Ocean between Hawaii and Mexico.
It covers approximately six million square kilometres. Large areas contain extensive fields of polymetallic nodules.
2. Seafloor massive sulphides
These deposits form around hydrothermal vents, where superheated, mineral-rich fluids emerge from cracks in the ocean floor.
When these fluids meet cold seawater, dissolved minerals precipitate, gradually building structures rich in metals such as copper, zinc, iron and sometimes gold and silver.
Hydrothermal vents are particularly fascinating because they support unusual biological communities. Instead of relying directly on sunlight, many organisms depend on chemosynthesis.
Microorganisms use chemical energy, including compounds such as hydrogen sulphide, to produce organic material that supports entire ecosystems.
These habitats are among the most unusual biological environments on Earth.
3. Cobalt-rich ferromanganese crusts
These deposits accumulate on the surfaces of underwater mountains known as seamounts. They can contain cobalt, nickel, manganese and other valuable metals.
Unlike loose nodules, they form a coating on the underlying rock. Extracting them could involve removing or damaging the surfaces of seamounts, potentially destroying habitats used by deep-sea organisms.
Each of these three environments presents different geological and ecological challenges. Treating them as though they are interchangeable would be a serious mistake.
Why does the world want these minerals?
The transition towards electrification and renewable energy has increased demand for several metals.
Nickel and cobalt are used in some rechargeable battery chemistries. Copper is essential for electrical wiring, motors, generators, transformers and power networks. Manganese has numerous industrial applications, including steel production and battery technologies.
As countries invest in electric vehicles, renewable electricity generation, energy storage and digital infrastructure, demand for certain minerals is expected to increase.
There are also national security considerations. Governments are concerned about concentrated supply chains, particularly where processing and refining capacity is dominated by relatively few countries. China, for example, occupies an important position in the processing of several critical minerals.
For governments seeking more diversified supply chains, the ocean floor represents a potentially attractive alternative.
Mining companies argue that seabed resources could help reduce dependence on terrestrial mining and provide additional supplies of strategically important materials.
However, the economic case is more complicated than it first appears. Extracting minerals from several kilometres beneath the ocean requires specialised vessels, remotely operated machinery, substantial energy, processing facilities and complex logistical arrangements.
The commercial viability of large-scale operations remains uncertain.
There is also no guarantee that seabed mining would replace terrestrial mining. It could simply add another source of supply to an already complex global minerals industry.
The Clarion-Clipperton Zone: A world scientists are still discovering
Perhaps nowhere illustrates the potential conflict more clearly than the Clarion-Clipperton Zone, commonly known as the CCZ.
This vast region of the Pacific contains extensive fields of polymetallic nodules. It is also home to an extraordinary variety of deep-sea organisms.
Scientists have identified thousands of animal species in the region, including worms, crustaceans, sponges, molluscs and unusual microscopic organisms.
Many species remain undescribed.
Some organisms are so specialised that they depend directly on the nodules themselves.
For example, certain sponges attach to the hard surfaces of nodules because the surrounding sediment offers few suitable places to anchor.
Removing the nodules therefore removes not simply a mineral resource but also part of the physical structure supporting the ecosystem.
This creates an unusual problem. The minerals companies want to extract are also part of the habitat required by some of the organisms living there.
Unlike forests, which may regrow if conditions allow, the geological structures supporting these ecosystems can take millions of years to develop.
Replacing them is not a realistic restoration strategy.
What happens when the machinery arrives?
Deep-sea mining equipment is designed to collect mineral deposits from the ocean floor.
In the case of polymetallic nodules, large tracked collection vehicles move across the seabed, gathering nodules and transporting them towards a surface vessel through a lifting system.
The machinery can disturb sediment, crush organisms and alter the physical structure of the seabed.
But the effects may extend beyond the immediate mining tracks.
One major concern is the creation of sediment plumes. As machinery moves across the seabed, it disturbs fine particles that can become suspended in the surrounding water.
These particles may then be transported by ocean currents before eventually settling elsewhere. The consequences depend on factors including particle size, currents, depth, local geology and the methods used by the mining operation.
A 2025 study published in Nature Communications examined sediment disturbance during a deep-sea mining equipment trial at approximately 4,500 metres.
Researchers found that a sediment gravity current travelled approximately 500 metres downslope. Suspended particles were detected as far as 4.5 kilometres from the mining area, the limit of the monitoring zone.
The highest concentrations were recorded close to the seabed. This demonstrates that the physical effects of mining are not necessarily confined to the tracks made by the collection machinery.
The exact extent of ecological damage will vary between locations and operating methods, but the potential for wider disturbance is clear.
The 44-year warning: What happens after the machinery leaves?
One of the most important scientific findings concerning deep-sea mining comes from an experiment conducted in the Pacific Ocean in 1979. Researchers disturbed an area of the seabed to investigate the possible consequences of future mineral extraction.
The experiment created a rare opportunity to examine what happens to deep-sea ecosystems over several decades following disturbance.
In March 2025, researchers published findings in the journal Nature examining the site approximately 44 years later.
The results were significant.
Although some organisms had begun to recolonise disturbed areas, many biological differences remained.
The physical disturbance was still detectable. Some organisms and ecological communities had not returned to their previous condition.
The researchers concluded that the biological effects of direct seabed disturbance could persist for at least decades.
This is particularly important because deep-sea environments operate on different timescales from many familiar terrestrial ecosystems.
Organisms living in the abyssal plains often grow slowly, reproduce infrequently and exist in environments where available food is limited.
Recovery may therefore be extremely slow.
The study does not prove that every future mining operation will produce identical effects. Modern equipment and operating methods may differ from those used in the original experiment.
However, it provides compelling evidence that the deep seabed cannot simply be assumed to recover quickly after industrial disturbance.
And that should give policymakers considerable reason for caution.
What about the food chain?
The potential effects of mining may extend beyond animals living directly on the seabed. The ocean contains enormous communities of organisms suspended within the water column.
These include zooplankton, small crustaceans and other organisms that form important links in marine food webs.
Some mining proposals involve discharging processed water and fine sediment back into the ocean.
The location of that discharge is particularly important.
A study published in Nature Communications in 2025 examined the potential effects of mining-associated particles released into midwater environments.
Researchers found that these particles could dilute naturally occurring food particles used by organisms in the water column.
Their findings suggested potential disruption to food-web relationships involving zooplankton and small marine animals, with possible consequences extending to larger predators.
This is an important distinction.
Deep-sea mining is not necessarily just a question of damaging the seabed.
Depending on the extraction and waste-disposal methods used, it could affect biological communities at several different depths. The ocean is an interconnected system. Disturbance in one part does not automatically remain there.
How much of the deep ocean have we actually explored?
This is perhaps the most uncomfortable question surrounding the entire industry.
The ocean covers approximately 71% of Earth's surface. Its deepest environments remain among the least explored places on the planet.
Scientists have mapped large areas of the seabed using sonar and other remote sensing technologies. But mapping the shape of the ocean floor is not the same as understanding its biology.
A detailed map cannot tell us every species living in a particular location, how those organisms interact or what role they play in maintaining the wider ecosystem.
Even where mining companies have conducted environmental surveys, the scale of the proposed operations presents a challenge.
A survey of a relatively small area cannot necessarily establish the long-term consequences of disturbing an enormous region.
There are also significant gaps in our understanding of deep-sea biodiversity. Some organisms have only recently been discovered. Others may be present in extremely low numbers or occupy very restricted geographical ranges.
It is possible that mining could damage habitats supporting species whose existence has not yet been documented.
This is not simply an argument based on the unknown. It is a recognition that the scientific evidence is incomplete, while the consequences of industrial disturbance could be difficult to reverse.
The international battle over who controls the seabed
Mining the deep ocean is not simply a commercial matter. Much of the seabed lies beyond national territorial waters.
Under the United Nations Convention on the Law of the Sea, mineral resources in these international seabed areas are designated the common heritage of humankind.
Their management falls under the responsibility of the International Seabed Authority (ISA), based in Kingston, Jamaica.
The organisation is responsible for developing regulations governing mineral exploration and any future commercial exploitation in these international waters. It also has a responsibility to protect the marine environment.
This creates an enormous challenge. The ISA must balance the interests of countries seeking access to mineral resources with the obligation to protect an environment that belongs to humanity collectively.
Its Mining Code, the proposed framework governing commercial extraction, has been under negotiation for years.
At the ISA's 31st session in July 2026, member states made progress on a roadmap for continuing negotiations.
However, significant disagreements remained unresolved. As of October 2026, a comprehensive international exploitation framework had still not been finalised.
The absence of agreed commercial regulations has become increasingly important as some companies seek to accelerate their plans.
The United States takes a different approach
A major development occurred in April 2025 when President Donald Trump signed an executive order entitled Unleashing America's Offshore Critical Minerals and Resources.
The order directed US agencies to accelerate the development of domestic offshore mineral resources, including deep-sea minerals.
It also encouraged the use of existing American legislation to process applications for exploration and commercial recovery.
This created a significant international dispute. The United States is not a party to the United Nations Convention on the Law of the Sea and is not an ISA member state.
Its approach therefore differs from the international framework used by countries participating in the ISA system.
In August 2026, the US National Oceanic and Atmospheric Administration (NOAA) announced that it had determined that a consolidated application from The Metals Company USA met the information requirements necessary to proceed through the next stage of its review.
The application concerns exploration and proposed commercial recovery of polymetallic nodules in the Pacific.
Importantly, NOAA's determination did not itself grant commercial mining permission. Further regulatory assessment and environmental review remained necessary.
The development nevertheless represents a significant step towards commercial seabed mining outside the conventional ISA exploitation framework.
It also raises questions about international cooperation.
If different countries adopt competing regulatory systems, could the result be a fragmented approach to managing an environment that does not respect national boundaries?
The Metals Company: The commercial race
One of the most prominent companies pursuing deep-sea mining is The Metals Company (TMC). The company has focused much of its attention on the Clarion-Clipperton Zone, where it has conducted exploration and equipment testing.
Its business model centres on recovering polymetallic nodules and processing them to extract valuable metals.
TMC argues that seabed minerals could help support the energy transition and reduce dependence on some conventional mining operations.
It also maintains that its approach could offer environmental advantages compared with certain forms of terrestrial mining.
These arguments deserve examination rather than automatic dismissal.
Land-based mining can cause serious environmental damage. Open-cast mines can destroy habitats, contaminate waterways, displace communities and generate substantial waste. The production of metals also has a carbon footprint.
However, demonstrating that terrestrial mining has environmental costs does not establish that deep-sea mining is environmentally preferable.
The correct comparison must consider the entire lifecycle of both approaches. That includes extraction, processing, transportation, energy use, waste disposal, biodiversity impacts and long-term restoration.
A fair comparison must also account for the fact that some terrestrial mining impacts can be mitigated or rehabilitated, whereas the removal of geological structures that took millions of years to form presents a very different challenge.
Is there really an alternative?
The argument that deep-sea mining is necessary for the future of clean energy deserves particular scrutiny. The world certainly requires substantial quantities of critical minerals.
But the assumption that these must come from the seabed is not established.
Several alternatives deserve greater attention.
Better recycling
Millions of electronic devices, batteries and electrical products contain valuable metals. Improving collection, processing and recycling could recover a greater proportion of materials already extracted from the Earth.
Battery recycling technology is developing rapidly, although collection systems, economics and processing capacity remain challenges.
More efficient battery technology
Battery chemistry is not static. Lithium iron phosphate batteries, for example, do not require nickel or cobalt. Sodium-ion batteries are also being developed for applications where their particular characteristics may be advantageous.
Other chemistries are under investigation. Not every battery needs the same combination of materials.
Responsible terrestrial mining
Existing mineral resources could potentially provide additional supplies through improved extraction methods, better environmental controls and greater transparency.
This does not eliminate the environmental consequences of mining on land, but it offers another avenue that should be considered alongside seabed extraction.
Reducing demand
Longer-lasting products, improved repairability, better public transport and more efficient industrial processes can reduce the amount of new material required.
None of these alternatives will solve every supply problem.
But together they challenge the suggestion that industrialising the deep ocean is an unavoidable consequence of technological progress.
What is Britain's position?
The UK has taken a precautionary position towards commercial deep-sea mining. In October 2023, the Government announced support for a moratorium on granting exploitation licences through the International Seabed Authority.
Its position is that commercial extraction should not proceed until there is sufficient scientific evidence to assess the environmental consequences and strong, enforceable international regulations are in place.
The Government reiterated this position in a parliamentary answer on 1 September 2025.
However, there is an important complication. The UK has also sponsored exploration contracts through UK Seabed Resources covering approximately 133,000 square kilometres of the Pacific seabed.
Exploration contracts permit scientific investigation and resource assessment. They are not the same as commercial exploitation licences.
Nevertheless, the distinction illustrates the complexity of Britain's position.
A country can support research into seabed minerals while opposing commercial extraction until environmental safeguards are established.
Whether that approach ultimately provides sufficient protection is another question.
What would happen if we simply left the seabed alone?
It is worth considering the alternative.
The deep ocean is not an empty resource waiting to be developed. It is a complex environment that has evolved over extraordinary periods of geological time. Its organisms participate in nutrient cycling, carbon processes and wider marine ecological relationships.
The precise contribution of individual deep-sea habitats to global environmental systems remains an active area of scientific research.
We should therefore be cautious about making exaggerated claims that deep-sea mining would automatically trigger a global ecological catastrophe.
The evidence does not establish that.
But neither does it support the assumption that large-scale mining would be harmless.
- We already know that direct disturbance can leave biological effects lasting for decades.
- We know that sediment plumes can travel beyond mining tracks.
- We know that proposed waste-discharge methods could affect organisms in the water column.
- And we know that many species and ecological relationships remain poorly understood.
That is a substantial body of evidence to consider before committing to industrial-scale extraction.
The question of ownership: Does everything have to become a resource?
There is a deeper issue beneath the technical and environmental arguments. Humanity has developed an extraordinary ability to identify something valuable in almost every environment.
Forests become timber resources. Rivers become energy resources. Mountains become mineral deposits. Oceans become sources of food, energy and transport.
Now, even the deepest parts of the ocean are being viewed through the lens of commercial opportunity. There is nothing inherently wrong with using natural resources. Modern civilisation depends upon them.
But the ability to extract something does not automatically establish that doing so is sensible.
Some environments may be worth more in their natural state than they are as sources of raw materials.
The deep seabed presents a particularly difficult example because the consequences of disturbing it may be irreversible on human timescales.
Once a field of nodules has been removed, it cannot simply be replanted. Once a unique habitat has been destroyed, we cannot assume that the organisms dependent upon it will return.
And once a species disappears, there is no guarantee that science will ever understand what has been lost.
A decision that could outlast us
The race to exploit deep-sea minerals is accelerating. Governments want secure supplies of critical materials. Companies see commercial opportunities. The energy transition creates genuine demand.
But the scientific evidence is increasingly demonstrating that the deep ocean is not an environmentally expendable frontier.
The 44-year mining experiment is particularly sobering. It shows that even relatively limited disturbance can leave biological consequences lasting for decades.
The potential scale of future commercial operations is considerably greater.
There may eventually be a case for carefully controlled seabed extraction in particular circumstances.
But such a decision should follow comprehensive scientific investigation, transparent international regulation and a convincing demonstration that the benefits outweigh the environmental costs.
It should not be driven simply by commercial urgency or geopolitical competition.
Humanity has already transformed much of the planet's surface. We have cleared forests, altered rivers, exhausted fisheries and changed the chemistry of the atmosphere.
The deep ocean represents something different: an enormous environment that we have barely begun to understand.
Perhaps the most important question is not how much wealth lies beneath the seabed.
It is how much knowledge, biodiversity and natural heritage we risk losing before we even discover what is there.
We have spent centuries exploring the world. We should be careful not to destroy the parts we have only just begun to understand.
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