Aquatic Prosperity Vessels
A treatment plant that can reach the water that needs it.
Fixed plant treats whatever is piped to it. A bay will not be piped anywhere. So the plant goes to sea, and the constraints on the hull follow from that.
An Aquatic Prosperity Vessel is a working boat built around what it carries: an intake, gas preparation, a closed reactor, an outlet, and the instruments that govern all four. The designation is ours. The flag, the survey and the manning are entirely ordinary.
Why the treatment works is SeaBreather's physics.
The deck, item by item
None of these is exotic. The engineering is in fitting the set onto a hull that can still hold station in a two-meter sea.
- The intake A coarse bar-rack that keeps large animals and debris out, a low approach velocity, and a draw depth set to the layer that has failed, chosen off the profile taken on arrival. Inside a contracted zone, certain areas are mapped as places no water is taken from at all.
- Gas preparation Ozone is generated on board and consumed inside the pass that called for it, so none is ever stored, which keeps the stage ordinary to permit. The reactor feed is made up for the duty in front of it, blend and rate both set on the day.
- The contained reactor Inside the hull, gas is sheared into the sub-micron range in line with the flow, and the water being treated never touches the bay. None of it stops moving.
- The outlet Treated water returned to the water it was drawn from, at the layer that lost its oxygen. On a stratified estuary in August, that means below the thermocline. Effluent put into the warm skin of a capped column leaves the failed layer as it was.
- The instrument set Profiling through depth for dissolved oxygen, temperature, salinity, pH and turbidity, plus sampling points on the water going in and the water going out. Read either side, at the same depths, every pass.
- The log Position, time, draw depth, throughput, the duty the reactor ran, and the assays either side of it, each entry made during the pass it describes. It is the first file an inspector opens, and it is treated as the product.
- Endurance Fuel, gas, crew hours and hull time. Replenishment for all four is designed into the zone before the first pass, with the berth, the supplier and the interval named.
Nineteen thousand liters a minute is an intake before it is anything else, so eggs and larvae get four engineering answers: bar-rack, low approach velocity, selectable draw depth and exclusion areas. A large animal at the rack halts the work outright. The intake's effect on your water is assessed at the site read and written into the scope.
What decides the tier
Vessels are specified in three tiers: Nimble, Standard and Mega. None of the three is in the water yet, so a tier is a specification a zone gets read against and the table describes the reading. Physical constraints settle which one suits a zone long before budget comes up, and the constraints usually disagree with each other.
| Constraint | What it settles |
|---|---|
| Draft over the shallowest working ground | The hard ceiling, and the one that usually decides it. |
| Transit time from a usable berth | How much of a working day is treatment and how much is passage. |
| Endurance between resupply | Whether a hull works to a schedule or to a supply chain. |
| Deck area and power | How much generation and oxidation capacity physically fits. |
| Sea state and crew rotation | How many days in a working year are genuinely on the water. |
Shallow ground beats everything else on the list. A reef flat or a lagoon entrance rules out a bigger hull whatever the budget says, and a far corner of a zone first reached at noon gets treated badly every week the program runs. Endurance sets the ceiling on the tiers: past a certain zone size the question is no longer what one hull can absorb between passes, but what configuration goes on the water.
Which tier suits which kind of water is tabulated by SeaBreather. These constraints can rule a tier out even where the water suits it.
Super SeaBreather
Past a certain zone size, the answer stops being a bigger hull and starts being a second one.
A vessel steaming to a replenishment berth treats nothing. On a small zone that is an inconvenience. On a national program it is the difference between a fleet and a rota.
The Super SeaBreather configuration is specified to work as a pair, so the treating hull stays on station instead of in passage. At that size an industrial gas partner with regional supply becomes part of how the program is built. The commercial shape (direct delivery by Alarivean, a joint venture, a license from Sophia Delta) is settled program by program. The systems are always run as a service rather than sold or rented.
The pairing is a way of deploying the same hulls, each carrying the same treatment stage.
Specifications and the permit
A permit, a regulator, and the craft it allows in the water.
Two throughput figures, two different boats. Added together they describe no craft at all.
Where the class stands today: the SeaBreather class is specified and is not yet in the water. The one craft a regulator has permitted is the modified personal watercraft named in the Florida permit. So a throughput figure for the class is a design specification, and the Florida figure is a permit fact about a different and much smaller boat.
A SeaBreather hull is specified at approximately 5,000 gallons per minute of contained throughput, about 19,000 liters a minute, returned oxygen-enriched to the water it was drawn from. Nothing is stored on the deck, so the discharge a permit governs is the flow the intake took a moment earlier.
The other figure belongs to a different craft. Florida's Department of Environmental Protection issued permit FLOA00062 in September 2024 for a red tide mitigation trial, on a five-year window that opens only when live Karenia brevis exceeds 100,000 cells per liter. The boat named in it is a modified personal watercraft producing ozonated seawater at 1,000 to 2,000 gallons a minute, a fraction of a SeaBreather's displacement and throughput. The Sarasota Bay Estuary Program and the nonprofit START each wrote up the grant on their own sites.
A state regulator examined the proposal and allowed a bounded trial in its own water. Proving it across a bay comes next, and the estuary program has asked to monitor that work. The documents behind a program are listed in one place.
Asked by harbormasters and naval architects
Four about the hull
Is there a SeaBreather in the water today?
No. The class is specified and not yet in the water. The one craft a regulator has permitted is the modified personal watercraft named in Florida DEP permit FLOA00062.
So a tier is a specification a zone gets read against, and the fleet a zone would carry is confirmed at the site read and written into the agreement before anything is committed.
What does APV stand for?
Aquatic Prosperity Vessel. The name is ours; no registry uses it.
Flag, survey and manning follow the ordinary rules for a vessel of that size in that water. No maritime authority is asked to invent a category.
What throughput does a hull contract to?
Approximately 5,000 gallons per minute per vessel, about 19,000 liters a minute, of contained throughput. A single capacity treats and oxygenates on one pass. It is a design specification for a class not yet in the water.
The calibration phase measures it on your water against parameters set down in writing beforehand. A result that misses those parameters closes the phase. A figure for a named bay follows the site read, never precedes it, and carries its assumptions in writing.
Will a hull actually be there when the water turns?
That is what a subscription buys. Hulls, gas supply and accredited crew are held against your zone continuously, so a forecast changes the tasking order for the week and nothing else.
Coverage is confirmed at the site read and written into the agreement. Called after the water has turned, a fleet has to be found, moved and accredited in a hurry, which takes longer than a bloom takes to close a beach and is charged accordingly, where it is offered at all.
The duties this hull carries
Draft, distance, exposure
Send us a chart and a month.
Bathymetry, the nearest working berth and your peak months are enough to say which tier would work that zone through a year, and whether one hull carries it or it takes a fleet.