How we deliver on service commitments.
An Aquatic Prosperity program is a zone with an agreed edge, a set of indicators written for the water inside it, the hulls that ground will take, a treatment stage, and instruments read by an institution that does not work for us. We keep improving all five, which is how a commitment made at signature is still worth something years later. Vessels, materials, instruments, platforms, people, processes — all of it sits on our side of the line. Turnkey, and meant literally.
The parts
Five things get assembled, and only one of them is a boat.
The vessel is the visible part and the least interesting one. What decides whether the water holds is the four things around it.
- A boundary An area of water with an edge, agreed in writing. The edge is where our accountability starts and stops: inside it we answer for the condition against the agreed indicators, outside it we do not, and a hull's reach has nothing to do with where the line was drawn. Deep Strikes run outside it all the same — on water heading your way, and on bloom features far enough out that nobody would call them adjacent to anything.
- Ongoing subscription Service runs continuously, in one shape only: an ongoing subscription delivered by a licensed service operator. Where the effort goes shifts with the water — bloom season on one coast, the stratified months on another, the fortnight either side of a marine heatwave on a reef. Those windows steer the tasking. They do not bound the engagement. A minimum subscription period sits underneath, and we earn it in both directions: the contracted outcomes are demonstrated through the calibration phase, then held there by the service that runs on afterward. Structured that way, the work stays preventive, and preventive is the cheaper end of this business.
- A fleet to suit Three tiers — Nimble, Standard and Mega — and which of them can work a given stretch is settled by physics rather than by budget. Draft over the thinnest ground a hull has to cross decides it more often than anything else does: a reef flat or a sill at a lagoon mouth ends the argument for a larger vessel on its own. Distance from a berth that can take that hull decides how much of a day goes into treating and how much into steaming. Shallow water over sand and coral wants one answer, a dredged port basin with a berth that has to keep working wants another, and a zone holding both wants more than one hull on the water. None of that stays put. Our service model drifts with that tide, deploying whatever vessel systems the job needs. The vessel page has more on the boats.
- A treatment stage An intake, a closed reactor and an outlet. Water is taken in, treated on its way through, and returned oxygen-enriched to the layer that lost it, at concentrations your consent fixes and the outlet is sampled against. The oxidation duty runs under independent scientific oversight, which reads the outlet data as it lands. And it is one duty among several: other treatment capabilities sit behind it, deployed as the water requires and regulated under that same oversight. The treatment page shows more on the chemistry and the discharge controls.
- Instruments, and a second party reading them Telemetry, profiles and imagery, with standing access to all of it for the institution that already answers for that water. Controls and data.
The technical detail
The naval architect, the chemist and the data team.
Those three desks ask different questions and rarely accept each other's answers. So the hull, the treatment stage and the record are set out separately, at the depth each of them works at.
SeaBreather vessels
The hull, the three tiers, what is bolted to the deck, and the constraints that settle which vessel can work which ground.
The treatment stage
Gas preparation, the contained reactor, the mass-transfer band a gas budget is sized from, and the discharge standard the effluent has to meet at the outlet.
Controls and data
How a dose gets decided on the day, what stops a pass, how hulls are routed, and what leaves the program as a record.
The boundary
Bathymetry draws the zone before the budget does.
Where the line goes is an engineering question first. Shallow ground dictates which hull can work it; distance from a berth dictates how much of a day the hull spends steaming to reach the ground it has to treat; the prevailing wind dictates where tomorrow's problem arrives from.
Zones are not drawn freehand either. Each one is baselined against its own oceanography before it is written into anything — what the water does through the year, what already lives in it, which months carry the exposure — and the indicators it gets held to come out of that record, which is why two adjacent zones can end up on different limits. Characterization is the work. Take one example: a cool-temperate inverse estuary in South Australia, where no hull works yet, characterized precisely because its physics contradicts the Gulf's at nearly every point — which is the only honest way to find out whether a method travels or merely describes one warm sea.
What pulls a boundary in
Ground too thin for the tier available. A far corner that a single hull reaches late, until the zone earns more capacity than one hull can give it. Water somebody else already has an obligation over. A stretch where the exchange rate of the tide would take more hulls to hold than the benefit is worth.
What pushes it out
An intake approach just outside the obvious perimeter. A nursery ground that feeds the fishery inside it. The next bay upwind, which is where the bloom you will be treating in a fortnight is currently forming.
The calendar
The window is where the damage shows. It is not where it was decided.
Coastal damage is not evenly distributed through a year. It arrives in a window, and everybody plans around that window, which is the mistake.
In 2025 the Chesapeake ran 60 sustained days of hypoxia, against a long-term span of 78 to 116 days. Its daily maximum hypoxic volume reached 10.1 cubic kilometers, close to the median of 10.7. Those are real numbers about a real season, and the season is genuinely bounded. What is not bounded is the loading that fills it. Nutrients arrive on every month's rainfall, warmth builds through the spring, and the organic debt left by one summer is the position the next one opens from.
So the subscription runs the whole way round. A quiet February is not idle time you are paying for — it is the month in which July is being settled, and it is cheap to work compared with anything done under an advisory. What the hulls actually do in that week follows the water, and the tasking says so.
The people
A program is a crew list before it is a technology.
Five roles, and the fifth one does not work for us.
On the hull: a master and deck crew who hold the qualifications for that flag and that water. A treatment operator who runs the gas plant and the reactor, and answers for the effluent meeting its standard at the outlet. A water-quality technician who reads the column before the pass and again after it, at depth, because a surface reading either side of a treatment proves very little.
Ashore: an analyst who decides where hulls go tomorrow, working from telemetry, imagery and forecast risk. That tasking runs a day ahead of the water.
And outside: the local scientific institution engaged for the duration, holding the same live feeds the duty crew reads, free to bring instruments of its own. That role is written into the program, with its own name against the record it keeps.
Consumables
Gas is inside the subscription because gas logistics is where these programs fail.
Neither gas is exotic. Oxygen is an ordinary industrial commodity, and the ozone is made from it aboard as the pass calls for it, which leaves one hard problem in the middle. Getting industrial volumes of that oxygen to the hull, in the right place, week after week for years, on a coastline where the nearest plant may be several hundred kilometers away, is the unglamorous problem that decides whether the fleet works or waits.
At asset scale a vessel replenishes from shore. At national scale that runs out. So supply is engineered in at the design stage, with an industrial gas partner holding regional capacity as part of how the program is built. Past that threshold what a zone needs on the water changes too, and the fleet gets composed against the zone in the site read, tier by tier.
Either way it sits on our side of the boundary. You are not running a gas contract, and you are not the one explaining to a minister why the vessel is alongside instead of working.
A program that size still has to sit inside a commercial structure, and more than one will carry it: Alarivean delivering the service directly, a joint venture, or a license from Sophia Delta with or without one alongside. Which it turns out to be follows the jurisdiction and what the client already holds. The part that is not negotiable is the offer underneath — these systems go out as a service and are never sold or rented.
Scope
Where the boundary of the contract sits.
Four items that stay outside it, written into the scope at signature.
- It does not rewrite land use. Cutting what leaves a catchment is policy work, and it should be under way. A firewall set at the runoff hotspots holds the loading dynamic in check while that gets legislated and funded.
- It does not transfer your permitting relationship. The consent under which work happens in your water is yours, and we are the contractor named inside it.
- It does not sell you equipment. The systems are operated, never sold, leased or transferred, and the license they run under stays with Sophia Delta.
- It does not cool a whole sea, and nothing in a fleet turns a regional thermal signal around. Breaking a stratified cap is a local instrument and is sold as one: where the heat is arriving as a regional signal, working a single basin buys nothing, and the site read says so before the contract does. Shade is the second instrument — a dense cloud of bubbles standing between the sun and the water below, each one sending a little of the day's load back before it lands — and it is relief from the exposure, never an end to the event. How much water ends up under one is settled at the site read: how many hulls the zone can carry, and what the relief is worth to whoever is paying for it.
Elsewhere on the network
Asked before the technical questions start
Three about the shape of the thing
Can we buy a SeaBreather instead of a program?
No. The systems are licensed from our parent company, Sophia Delta, and stay with us, along with the crew, the permits and the liability. They are not for sale and not for hire.
What is purchasable is a subscription: the condition of a defined area of water, agreed before deployment and then held there by a licensed service operator that keeps working it. If your board needs an asset on the balance sheet, this is the wrong instrument, and the site read will say so before a proposal is drafted.
Who is actually on the boat?
A master and deck crew, a treatment operator running the gas plant and the contained reactor, and a water-quality technician reading the column at depth either side of every pass.
Ashore, an analyst decides where hulls go tomorrow. The oversight scientists answer to their own institution, and they see the readings at the same moment the duty crew does.
Does a program have to run all year?
Yes. That is not a billing preference, it is how the result is produced.
The Chesapeake's 2025 hypoxic season ran 60 sustained days against a long-term span of 78 to 116. The season is bounded; what fills it is not. Rain delivers nutrients in months nobody is watching, spring warming does the stratifying, and whatever was left rotting last autumn is where this year's oxygen budget starts. A subscription worked through all of that meets a smaller problem in July than one that switched on in June.
The alternative is to go looking for emergency treatment at the moment your position is weakest. It costs what emergencies cost.
Where the line would go
Tell us the water and we will tell you the shape.
The zone, the months it has to be hardest in, the tier and what sits outside the boundary all come back in the site read. Before that, all we need is a description of what goes wrong and when.