China’s push to host the High Seas Treaty secretariat in Xiamen is turning a technical administrative decision into a strategic contest over who will shape the rules governing international waters.
Delegates at the United Nations are now moving from drafting the treaty to building the system that will enforce it. That shift has brought new focus to the secretariat, which will coordinate scientific work, manage data sharing, support compliance, and help structure how marine protected areas and environmental rules are applied across the high seas.
From Agreement to Implementation
The High Seas Treaty entered into force in January 2026 after nearly two decades of negotiations. It establishes a framework for marine protected areas, environmental impact assessments, and access to marine genetic resources across areas beyond national jurisdiction.
The current phase is about execution. That includes setting up financing mechanisms, compliance structures, and operational rules. The secretariat sits at the center of that system, acting as both coordinator and gatekeeper for how the treaty functions in practice.
China Enters Late and Reframes the Decision
Until recently, Chile and Belgium were the primary contenders to host the secretariat. China’s late-stage bid has shifted the dynamic.
Beijing’s interest is tied to its broader position in ocean industries. It operates the world’s largest distant water fishing fleet, is active in seabed resource exploration, and has made the “blue economy” a core strategic priority. Hosting the secretariat would give China direct influence over agenda setting, scientific coordination, and how compliance mechanisms evolve.
Xiamen, the proposed host city, is being positioned as a global ocean governance hub, with established marine research institutions and a track record in coastal management.
China has also backed its bid with funding commitments, including more than $70 million over five years for the secretariat, alongside additional support for developing states.
Support and Resistance Split Along Strategic Lines
China’s combination of financial backing and institutional capacity is gaining traction with some developing countries, NGOs, and smaller states that see value in increased funding and scientific collaboration.
At the same time, skepticism is building among Western and regional stakeholders. Concerns focus on transparency, data governance, and whether the secretariat could become more state-centric if hosted in a country with active maritime disputes and expanding offshore interests.
There is also a broader concern that the institution could tilt toward a “blue economy” framework that balances conservation with commercial activity, rather than prioritizing strict environmental controls.
Why This Matters for Seabed Mining
For the ocean mining sector, the implications are direct.
The High Seas Treaty introduces new layers of environmental oversight and governance that will intersect with deep sea resource development. While it does not directly regulate mining, it shapes the broader framework in which activities like polymetallic nodule extraction will operate.
The secretariat will influence how marine protected areas are designated, how environmental impact assessments are interpreted, and how scientific data is collected and shared. All of those factors feed into permitting risk, project timelines, and the overall regulatory environment.
Control over the secretariat does not mean control over outcomes, but it does mean proximity to the process that defines them.
China’s bid signals that major powers are not just competing for access to ocean resources, but for influence over the system that will govern them.
The decision on where the secretariat is located will be one of the first real tests of how global ocean governance is shaped in practice.
