SWITCHED ON
The daily technology series nobody asked for but everyone needed
The Last Frontier: Ocean Technology and the Blue Economy
The ocean covers seventy-one percent of the planet's surface, generates half its oxygen, absorbs a third of its carbon dioxide, and remains more poorly mapped than the surface of Mars. The race to exploit it has begun. The governance framework to manage that race has not.
We have detailed maps of Venus. We have detailed maps of the Moon. We have mapped roughly twenty-five percent of the ocean floor with any meaningful resolution. The most biologically rich and least understood environment on Earth has been explored less thoroughly than the surfaces of worlds we will never stand on. That is about to change — and the question of whether the change is managed well is one of the more significant governance challenges of the coming decade.
Yesterday we fed the world — or at least examined the technologies that are trying to, from precision agriculture's soil sensors to drought-tolerant maize in Sub-Saharan Africa to the distribution problem that technology cannot solve on its own. Today we are going somewhere wetter and considerably less mapped. The ocean: the last major frontier of technological exploitation on this planet, the source of half the oxygen we breathe, the absorber of thirty percent of the carbon dioxide we emit, and the setting for a collision between the technologies being developed to exploit its resources and the governance frameworks that are nowhere near ready for what is coming. Deep-sea mining, offshore wind at scale, ocean-based carbon capture, and what the world's largest ecosystem looks like when humanity decides it is time to treat it as an industrial input. This is an episode that deserves your full attention, because the decisions being made about this right now are long-term ones, and they are being made with strikingly little public engagement given the stakes involved.
01 — What the Blue Economy Actually Is
The blue economy is the umbrella term for economic activity that depends on or takes place in the ocean: fisheries, shipping, tourism, offshore oil and gas, and the emerging sectors of offshore wind, aquaculture, marine biotechnology, and deep-sea mining. The World Bank estimates the ocean economy at approximately $1.5 trillion annually and growing, with the emerging sectors expected to outpace traditional ones over the coming decades. The framing reflects a broader shift in how economic planners are thinking about the ocean — not as a commons or a boundary but as a resource base with enormous untapped value.
The ocean's resource base is genuinely extraordinary. The seabed contains vast deposits of polymetallic nodules — potato-sized concretions of manganese, nickel, cobalt, copper, and rare earth elements that accumulated over millions of years. These minerals are critical inputs for the batteries, electronics, and renewable energy infrastructure the energy transition requires. The same cobalt that comes from the DRC's often-unethical mines is sitting on the ocean floor in quantities that dwarf known land-based reserves, in nodules that formed over millions of years in the Clarion-Clipperton Zone between Hawaii and Mexico. The offshore wind resource is virtually unlimited — wind is stronger and more consistent at sea than on land, without the land use conflicts that onshore wind faces. The ocean absorbs carbon dioxide and might be engineered to absorb more. These are real resources with real economic value. The question is what happens to the ocean's ecological function when we start treating it as a mine.
02 — Deep-Sea Mining: The Promise and the Alarm
Deep-sea mining — extracting polymetallic nodules, seafloor massive sulphide deposits, and cobalt-rich ferromanganese crusts from the ocean floor at depths of two to six kilometres — has been discussed as a future possibility for decades. The combination of rising demand for battery minerals, advances in remotely operated vehicle technology, and the energy transition's appetite for cobalt, nickel, and manganese has moved deep-sea mining from theoretical to imminently operational. The Metals Company, one of the leading deep-sea mining companies, has conducted extensive nodule collection trials in the Clarion-Clipperton Zone and has been pursuing regulatory approval for commercial operations through the International Seabed Authority, the UN body responsible for governing mining in international waters.
The ecological concerns are substantial and scientifically serious. The deep seabed is not the barren desert it was once imagined to be. It is home to extraordinarily diverse biological communities — many of which are entirely or substantially unstudied — that have evolved over millions of years in conditions of extreme cold, pressure, and darkness. Nodule fields are particularly important habitats: the nodules themselves serve as the only hard substrate in vast areas of otherwise soft sediment, and the communities they support are unique and largely irreplaceable on human timescales, since the nodules take millions of years to form. Mining operations create sediment plumes that can extend hundreds of kilometres, settling on and smothering the communities that mining did not directly disturb. The ecological consequences are genuinely unknown — not because we have assessed them and found them acceptable, but because the assessment has not been adequately conducted.
The precautionary principle — don't do the irreversible thing until you understand what you're destroying — has rarely felt more directly applicable than in deep-sea mining. The nodules took millions of years to form. The communities living on them took millions of years to evolve. The demand for battery minerals will change as technology advances. The destroyed ecosystem will not come back.
Several countries, including Germany, France, Chile, New Zealand, and others, have called for a moratorium on deep-sea mining until adequate environmental impact assessment can be conducted. The International Seabed Authority has been under significant pressure from both mining interests seeking regulatory approval and environmental advocates demanding the moratorium. The outcome of this regulatory contest will shape what happens to the deep ocean floor for the foreseeable future.
03 — Offshore Wind: The Success Story
In a section of this episode that deals predominantly with caution, offshore wind deserves a genuine positive assessment. It is the most mature and commercially successful of the emerging blue economy sectors, with a track record of delivering large-scale, low-cost, low-carbon electricity in the UK, Denmark, the Netherlands, and increasingly globally.
The UK operates the largest offshore wind capacity in the world, with turbines installed across the North Sea producing electricity at costs that have fallen dramatically over the past decade — from roughly £150 per megawatt-hour in early contracts to below £40 in more recent auctions, a cost reduction faster than almost any forecast predicted. The Hornsea projects, the Dogger Bank array, and the pipeline of projects under development represent a genuinely transformative contribution to UK electricity decarbonisation. Denmark generates more electricity from offshore wind than it consumes on many days. The technology has proved out at scale.
The challenges that remain are installation and grid connection — offshore installation is weather-dependent, requires specialised vessels that are in short supply, and the grid connections required to bring power from remote offshore locations to shore are expensive and slow to permit and build. Supply chain constraints for turbine components, installation vessels, and offshore cables are the primary bottleneck in offshore wind deployment globally, rather than the economics of the technology itself. These are solvable problems — they require investment in supply chain capacity and regulatory streamlining of grid connection approvals — and they are being addressed, unevenly and more slowly than the climate timeline would ideally require.
04 — Ocean-Based Carbon Capture
The ocean already absorbs approximately thirty percent of the carbon dioxide that human activity emits annually — an enormous and underappreciated service that comes at the cost of ocean acidification, as dissolved CO₂ forms carbonic acid and reduces the pH of seawater in ways that are already measurably affecting coral reefs and shell-forming marine organisms. The question researchers and startups are exploring is whether the ocean's carbon absorption capacity can be deliberately enhanced, and at what ecological cost.
Ocean alkalinity enhancement — adding alkaline minerals to seawater to increase its capacity to absorb CO₂ — is one approach attracting serious research and early-stage investment. The chemistry is well understood: alkaline minerals like olivine and limestone react with CO₂ in seawater to form stable bicarbonate ions, effectively converting atmospheric carbon dioxide into dissolved mineral that stays in the ocean. The uncertainties are ecological: what happens to the marine organisms in the area where alkalinity is enhanced, whether the approach can be monitored and verified for carbon accounting purposes, and whether it can be scaled to the gigaton level required to make a meaningful contribution to the carbon budget.
Seaweed farming at scale — growing kelp and other macroalgae that absorb CO₂ through photosynthesis and then sinking the biomass to the deep ocean where the carbon remains sequestered — is another approach being explored. The ecological dynamics of large-scale open-ocean seaweed farming, including effects on local marine ecosystems, nutrient cycling, and the permanence of deep-ocean carbon sequestration, are not yet adequately understood for confident deployment at scale. The research is serious. The deployment is not yet warranted. The temptation to rush, given the urgency of the climate situation, is real and needs to be resisted.
05 — Who Governs the Deep
International waters — the high seas beyond national jurisdiction, covering approximately half the planet's surface — are governed by a patchwork of international agreements that were designed for a world in which human technological capability to exploit the deep ocean was essentially nil. The United Nations Convention on the Law of the Sea, adopted in 1982, established the basic framework: the seabed and its resources in international waters are the "common heritage of mankind," governed by the International Seabed Authority for mining, while fishing and navigation are governed by separate regimes. The High Seas Treaty, finalised in 2023 after nearly two decades of negotiation, represents the most significant addition to ocean governance since UNCLOS, establishing a framework for marine protected areas in international waters and requiring environmental impact assessments for new activities.
The governance gap is wide. The International Seabed Authority's mandate — to both promote and regulate deep-sea mining — contains a conflict of interest that its institutional design has struggled to manage. The High Seas Treaty, while a significant achievement, is not yet in force pending ratification, and its provisions for enforcement and environmental assessment remain to be tested against actual commercial pressure. The organisations responsible for governing offshore wind development operate primarily at national jurisdiction level, creating gaps in regulation for the international shipping lanes, fishing grounds, and ecological corridors that offshore wind arrays will increasingly intersect.
The pattern, familiar from every episode of this series, reasserts itself: the technology to exploit the ocean's resources is advancing faster than the institutional capacity to govern that exploitation. The difference with the ocean is the irreversibility. Disrupted software markets can be re-regulated. Biased algorithms can be retrained. The deep-sea communities that took millions of years to evolve cannot be restored on any human timescale. The window in which getting this right is possible is not indefinitely open.
Tomorrow we are coming back to something deeply personal after two episodes of planetary-scale stakes — the technology of mental health. Digital therapeutics, AI therapy chatbots, the data privacy implications of mental health apps, and the genuinely difficult question of whether an app on your phone can substitute for, complement, or undermine the human therapeutic relationship. See you then.
Switched On is a daily technology series covering the ideas, systems, and arguments shaping the digital world. Opinionated. Witty. Occasionally wrong. Always worth the argument.
