A Dutch Startup Can Pull CO₂ from the Ocean — But It May Not Survive Long Enough to Matter
Delft, Sunday, 31 May 2026.
SeaO₂, a TU Delft spin-off, has proven it can extract CO₂ directly from seawater and is already earning revenue through carbon credits — yet the company is on the verge of bankruptcy. The culprit: investors waiting on each other.
A Technology That Works — and a Company That Might Not
On May 30, 2026, Delft-based climate startup SeaO₂ made an unusual and urgent public plea: a LinkedIn post calling on investors, partners, and the broader public to help save the company from imminent collapse [1]. The message was stark. Despite having validated its technology, completed a working pilot, and generated real revenues, SeaO₂ is facing bankruptcy — not because its science failed, but because its funding did [2]. The company is a spin-off of TU Delft, one of Europe’s most respected technical universities, and its core technology has reached Technology Readiness Level 6 (TRL 6), meaning it has been demonstrated in a relevant environment — a significant milestone in the development of any deep-tech innovation [2].
How SeaO₂’s Technology Actually Works
SeaO₂’s approach is known as Direct Ocean Capture (DOC), a method that extracts CO₂ directly from seawater rather than from the atmosphere [2]. The science behind it is compelling: seawater contains approximately 150 times more CO₂ per liter than air, making the ocean a far denser reservoir of dissolved carbon dioxide than the open atmosphere [2]. The company’s process works by splitting seawater into an acidic and a basic stream through an electrochemical process that uses electricity and requires no chemical additives [2]. CO₂ is captured during this separation, and the neutralized water is then returned to the sea [2]. The result is a system that is, in principle, both scalable and environmentally low-impact. By late 2024, SeaO₂ had validated this technology using North Sea water in a proof-of-concept system [2]. By 2026, the company was operating standalone systems with a capture capacity of 25 tonnes of CO₂ per year [2].
From Lab to Revenue — and Then to Crisis
SeaO₂’s commercial journey has been notable for a company of its age and size. In late 2024, the startup raised just over €2 million in seed capital — its only external funding round to date [1][2]. That capital was used to bring the technology out of the laboratory, run a successful pilot on North Sea water in 2025, and begin generating revenues through the sale of carbon credits to clients including Klarna [2]. CEO and founder Ruben Brands described the progress pointedly: ‘We have brought Direct Ocean Capture from the lab to a working pilot, TRL 6! We have generated our first revenues through carbon credits. We were on track for a cost per tonne that ranks among the most competitive in the sector: one of the most promising paths to affordable carbon removal that exists today’ [2]. Yet that progress has not been enough to keep the company financially afloat. The revenue generated from carbon credit sales and captured CO₂ has proved insufficient to sustain a team of 19 people and fund the construction of larger-scale systems [2]. The company has set its sights on raising €20 million in a Series A funding round in 2026, but that capital has not materialized [2].
The Investor Standoff: A Familiar Trap
What makes SeaO₂’s situation particularly frustrating — and illustrative of a broader systemic problem — is the nature of the funding breakdown. It was not a rejection of the technology. It was, in Brands’ own words, a paralysis of mutual dependency: ‘Capital was stuck. We sought investors at home and abroad, across Europe and beyond. Private investors waited for public commitments. Public players waited for private ones. And so nobody moved’ [2]. This dynamic — often described as the ‘valley of death’ in deep-tech innovation — is a well-documented phenomenon in which promising technologies with real-world validation fail to attract sufficient capital to bridge the gap between proof-of-concept and commercial scale [GPT]. For SeaO₂, this valley has proven nearly fatal. Brands added a broader warning in the same statement: ‘This is bigger than our team. As long as proven climate technology cannot attract capital, companies like SeaO₂ will disappear or relocate to where the money ultimately flows’ [2]. The implication for the Netherlands, which positions itself as a hub for climate innovation and blue economy technology, is direct and uncomfortable [1].
A Crowded Field and a Race Against Scale
SeaO₂ is not operating in an empty market. The company faces competition from 239 active rivals in the carbon capture space, of which 74 have received funding [2]. Among the more formidable competitors are Direct Air Capture (DAC) players based in Iceland and the United States that are already backed by significantly larger capital bases and are producing tens of thousands of tonnes of CO₂ per year [2]. The contrast is instructive: while SeaO₂ operates systems capturing 25 tonnes per year with a team of 19 and a total external investment of just over €2 million [2], larger DAC operators have attracted hundreds of millions in government and private backing [GPT]. SeaO₂ has set an ambition to remove one million tonnes of CO₂ annually by 2030 [2] — a target that would require scaling its current capacity by a factor of 40000, an enormous leap that is only achievable with substantial new investment. Without a Series A round, that ambition, along with the company itself, is at serious risk.
A Dutch Paradox: Many Startups, Too Few Scale-Ups
SeaO₂’s predicament does not exist in isolation. A broader analysis of the Dutch startup ecosystem, published in the week of May 23 to May 29, 2026, identified what it described as a ‘Dutch paradox’: the Netherlands produces a high number of startups but struggles to convert them into scale-ups [1]. The analysis points to two structural culprits — tailor-made support systems that are so finely tuned to the early stage that they inadvertently hinder growth, and a high rate of foreign acquisitions that pull promising companies out of the Dutch innovation pipeline before they reach market maturity [1]. For SeaO₂, the relevance is clear. The company has benefited from the Dutch deep-tech ecosystem — it is, after all, a TU Delft spin-off — but it is now confronting exactly the kind of funding gap that this paradox describes. Brands’ warning that companies like SeaO₂ may ‘relocate to where the money ultimately flows’ [2] resonates sharply against this backdrop: the Netherlands risks losing not just a startup, but a validated piece of climate infrastructure to another jurisdiction with deeper pockets and more decisive capital markets.
What Comes Next — and What Is at Stake
As of May 31, 2026, SeaO₂’s immediate future remains uncertain [alert! ‘No confirmed update on bankruptcy filing or new investment commitment has been identified in the available sources beyond the May 30, 2026 announcement’]. The company has publicly stated that ‘with a relatively modest investment, the tide can still be turned and we can act very quickly’ [2] — signaling that the window for rescue remains open, at least for now. The stakes extend beyond one company or one team of 19 people. SeaO₂’s Direct Ocean Capture technology, if scaled, could represent one of the more cost-competitive pathways to meaningful carbon removal, given the ocean’s unmatched CO₂ density advantage over air [2]. The case underscores an urgent need for better-structured public-private funding mechanisms that do not leave early-revenue climate startups stranded in the gap between government grants and institutional venture capital [1][2]. For policymakers and innovation managers in the Netherlands and across Europe, SeaO₂’s crisis is a signal: breakthrough climate technology alone is not enough without a financing ecosystem that moves at the same pace as the science.