How a new high seas treaty reshapes marine protection diving
The conversation about high seas treaty marine protection diving moved from theory to reality when the Agreement under the United Nations Convention on the Law of the Sea on the Conservation and Sustainable Use of Marine Biological Diversity of Areas Beyond National Jurisdiction (BBNJ Agreement) was adopted under United Nations auspices in June 2023. Covering nearly two thirds of the global ocean beyond national jurisdiction, this legally binding instrument gives governments new tools to create marine protected areas (MPAs) in international waters where only fragmented ocean governance existed before. For divers who chase remote seas and long blue horizons, the shift from voluntary conservation to enforceable management will change how we plan expeditions and how we meet marine biodiversity offshore.
The BBNJ Agreement is the first global treaty focused specifically on conserving marine biodiversity in international waters, and it sits alongside existing national and regional frameworks rather than replacing them. Negotiated at United Nations Headquarters in New York with UN Member States as signatories, the agreement establishes processes for designating high seas MPAs, conducting environmental impact assessments, and coordinating management across areas where no single country holds national jurisdiction. In practice, that means seamount chains, pelagic corridors, and deep ocean areas that liveaboards cross on long itineraries can now be proposed as protected zones with clear rules, monitoring obligations, and enforcement mechanisms such as boarding and inspection by flag or port states.
Under this new high seas treaty architecture, MPAs beyond national jurisdiction become central tools for long term conservation rather than aspirational maps on NGO reports. Implementation, now on the agenda of dozens of ratifying states and many more signatories, will influence decision making about which areas national governments nominate as protected and how human activities such as industrial fishing, seabed mining, and even large scale tourism are regulated. As marine policy expert Kristina Gjerde notes in a UN briefing, the treaty is designed to “turn the high seas from a free-for-all into a shared responsibility.” For divers, the key question is not whether the global ocean needs stronger protection, but how effective governance and capacity building will balance access with safeguarding the marine environment we travel so far to experience.
From liveaboard routes to pelagic corridors: what changes for dive travel
For high seas treaty marine protection diving, the most immediate impact will be felt along classic blue water routes where liveaboards already push beyond ocean national boundaries. Think of the long crossings between Galápagos and Cocos, the open ocean legs from Mexico’s Revillagigedo to Clipperton, or the deep offshore banks north of the Azores where hammerheads ride the current. These are precisely the kinds of areas national authorities and regional bodies may now propose as high seas MPAs or fully protected reserves under the BBNJ Agreement’s new governance framework.
Once specific offshore MPAs are adopted, operators will need to follow detailed management plans that set rules for zoning, visitor numbers, and acceptable human activities, from fishing to technical diving. Some areas national regulators may close entirely to tourism, while others could allow tightly controlled access that prioritises conservation outcomes and long term monitoring of marine biodiversity. For solo divers choosing operators, this will reward those who already work comfortably inside strict MPA rules, the same way smart travelers now seek out destinations with strong conservation governance and transparent policies on single supplements, as explored in our guide to solo diver friendly destinations.
Regulation will not be uniform, because the treaty relies on states to propose and then enforce protected areas through existing regional fisheries management organisations and new coordination mechanisms. That means some parts of the global ocean will see rapid implementation, robust enforcement, and effective conservation, while other seas lag as capacity building and monitoring systems catch up. As one Pacific liveaboard operator told us after the treaty was adopted, “we are already planning routes that avoid sensitive seamounts during spawning season, because we know those sites are likely to become formal MPAs.” For divers, the practical takeaway is clear: high seas treaty marine protection diving will increasingly mean checking which MPAs are in place, how their management rules affect access, and whether your chosen operator treats the new agreement as a floor or a ceiling for responsible practice.
Planning your next expedition under the new ocean governance map
As the new high seas biodiversity agreement regime matures, planning a serious expedition will feel closer to organising a technical cave trip than a casual reef week. You will need to understand which parts of international waters have been designated as MPAs, how those zones intersect with national jurisdiction, and what enforcement looks like on the water for both local authorities and flag states. The same mindset that sends you to specialist training before entering overhead environments should now guide how you research remote seamounts and pelagic walls, using tools such as environmental impact assessments and regional MPA maps rather than only operator brochures.
For divers who thrive on frontier feeling, this shift is not a loss; it is a recalibration of what access means when the global ocean finally has a legal shield. Routes that cross new protected areas may see stricter limits on group size, anchoring, and night diving, but over the long term those constraints should translate into denser schools, bolder pelagics, and healthier coral on deep reefs. The same logic already shapes advanced trips, from carefully managed cavern itineraries to remote archipelagos such as Oman’s Daymaniyat Islands, where Arabian Sea diving off the package tourism radar depends on respecting MPA rules that keep the marine environment resilient.
For now, divers can prepare by tracking how the BBNJ Agreement’s implementation on the agenda of UN Member States translates into concrete MPAs and by supporting operators who invest in compliance rather than shortcuts. That means asking how they engage with areas national authorities have proposed for protection, whether they contribute to monitoring or capacity building, and how they adapt itineraries when new zones are designated under the treaty. The United Nations describes the instrument in its official overview as a “legally binding agreement to ensure the conservation and sustainable use of marine biological diversity of areas beyond national jurisdiction,” and notes that it will enter into force 120 days after the 60th instrument of ratification, acceptance, approval or accession has been deposited with the UN Secretary-General.
For divers who want to go deeper into how regulation shapes advanced trips, our feature on cave and cavern diving where training meets the travel itch offers a useful parallel. In both overhead environments and high seas protected areas, effective management, clear governance, and respect for limits are what turn fragile spaces into long term destinations rather than one season wonders. The new seas treaty does not end frontier diving; it simply insists that the frontier be managed with the same care we expect from any serious expedition, from gas planning to exit strategy.