Submera submerges GPU compute hardware directly into natural water bodies using passive thermodynamics to reject heat with zero mechanical cooling. No pumps. No fans. No chillers. Just physics.
Modern GPU racks generate up to 120 kW per rack, six times what air cooling can handle. The industry spends billions of dollars, millions of gallons of freshwater, and acres of real estate just managing heat. Cooling has become the bottleneck of the entire AI infrastructure stack.
Air cooling physically maxes out at 15–25 kW per rack. The newest GPU systems generate 5–8× that load. Air cooling is not a future option, it is already obsolete at the frontier.
For every watt going to compute, 0.58 watts are wasted on cooling overhead. At hyperscale, that represents billions of dollars in electricity consumed annually without doing any useful work.
Evaporative cooling towers consume tens of millions of gallons of freshwater annually per data center. Regulators and communities in water-stressed regions are pushing back hard.
The data center cooling market is growing at 22.3% CAGR, expected to reach $128B by 2033. The industry is not looking to optimize existing cooling. It needs to reinvent it entirely.
Submera places sealed aluminum enclosures containing GPU hardware directly into a natural water body. Heat moves from hardware to dielectric fluid to CNC billet lid to pond water, entirely by the laws of thermodynamics. No mechanical system required at any step.
Precision-fabricated, hermetically sealed aluminum housing. Aluminum conducts heat at 167 W/m·K, among the highest of any structural metal. The enclosure wall is the heat exchanger. No additional components needed.
Hardware is bathed in EDM250 dielectric fluid, electrically inert, non-corrosive, and safe for direct contact with all server components. Natural convection circulates the fluid inside the enclosure, carrying heat from GPUs to the walls continuously without any pump.
A river, lake, reservoir, or ocean at 40–65°F acts as an effectively infinite heat sink. No matter how many watts the GPUs generate, the water continuously absorbs and carries that energy away. Cooling capacity scales with water flow, not with mechanical infrastructure.
Power and fiber run through a single armored conduit from the submerged frame to shore infrastructure. The deployed node is operationally identical to a rack-mounted GPU server, remotely monitored, fully accessible, invisible to the software stack above it.
Submera is engineered to coexist with the water bodies it occupies. The dielectric is water-soluble and biodegradable in the event of an enclosure breach. No PFAS, no persistent contamination, no oil-style spill response required. Heat rejected to the pond raises only a thin 1–3 ft thermal stratification layer immediately around each enclosure, which dissipates back to ambient within feet of the unit. Every pond is treated as an active ecosystem; unit spacing, depth, and thermal load are tuned so fish, amphibians, and aquatic vegetation continue to thrive alongside the deployed compute.
Submera deployments mirror the cellular and radio tower model. Private landowners host the infrastructure on their property in exchange for a flat-rate lease payment, priced by pond surface area. Owners keep the land, keep the pond, and gain a recurring revenue stream from acreage that would otherwise generate nothing. For Submera, it unlocks national-scale deployment without ever owning real estate. For the landowner, it turns a pond into a long-term income asset.
A single Submera deployment site uses two ~1.5-acre ponds and two small shoreline power huts. That is the entire physical infrastructure required to bring 83 GPU compute units online. No building, no chillers, no cooling towers.
Candidate sites are evaluated for water body suitability: depth (8–15 ft target), riverbed or pond-floor stability, and year-round water temperature. Submera targets locations where ambient water stays below 65°F, which covers the vast majority of U.S. inland water bodies.
Two oval ponds of approximately 1.5 acres each are selected or constructed on the property. Each pond becomes a self-contained cooling environment, sized to dissipate the heat of roughly half the unit count without thermal saturation, even at full sustained load.
A small equipment hut sits on a concrete pad beside each pond, labeled PWR-A and PWR-B, housing electrical service, network ingress, and monitoring. Power lines run underground; nothing overhead, nothing visible from a distance. The huts are the only above-grade structures.
83 sealed Submera enclosures are deployed across the two ponds, 42 in Pond A and 41 in Pond B, arranged in a staggered grid pattern that maximizes spacing for thermal exchange. Each unit is fully submerged 1–2 ft below the surface.
Each unit is tethered to a bottom anchor and held at consistent submersion depth by a small float marker at the surface. The system is self-leveling. As pond water levels shift seasonally, every unit tracks the surface automatically with zero mechanical intervention.
Armored umbilicals run from each power hut underground to the units. Within minutes of submersion, GPU junction temperatures reach thermal equilibrium. Validated testing showed 50–57°F temperature reduction and full equilibrium in under one hour at sustained load.
A standard Submera deployment site consists of two ~1.5-acre ponds, each holding roughly half the unit count, with a small power hut on the shore of each pond. All electrical and network conduits run underground. The visible infrastructure footprint is intentionally minimal.
The two-pond, 83-unit configuration is Submera's standard site module. Additional pond pairs can be added in parallel on adjacent acreage, with each new pair adding another ~83 units and one or two additional power huts. Cluster-scale deployments of 250+ units on a single property are achievable with no additional facility construction.
Submera is not tied to a specific geography. Anywhere there is a natural or managed water body with sufficient depth and flow, Submera can deploy. The U.S. alone has over 250,000 rivers and streams and thousands of lakes, representing an enormous untapped deployment surface.
Flowing water provides a continuously refreshed heat sink with no recirculation required. Moderate flow rates of 2–4 mph are ideal, enough to exchange heat at the enclosure surface without requiring heavy anchoring. The Blue River corridor in Kansas City is Submera's initial target deployment zone.
Still water bodies with sufficient depth provide stable thermal stratification. Submera's proof-of-concept validation was conducted at Hamilton Lake Reservoir in January 2025, achieving 57°F temperature reduction at 300W sustained load with zero mechanical cooling assistance.
Managed channels, cooling ponds, and industrial waterways adjacent to power infrastructure offer ideal co-location opportunities. Proximity to grid power combined with continuous water flow makes industrial waterways highly attractive for high-density GPU deployments.
Ocean-adjacent deployments and international markets in power-constrained regions, particularly across Africa and Southeast Asia, represent significant long-term opportunity. Water-cooled compute at near-zero PUE is especially compelling where grid power is expensive or unreliable.
Submera's V1 system, a Dell PowerEdge R610 in a custom-fabricated sealed aluminum enclosure, was submerged at Hamilton Lake Reservoir in January 2025. The results validated the core passive thermal siphon hypothesis with measured data across all sensor positions.
Temperature reduction across all sensor positions, bulk fluid, enclosure wall, and lid, compared to air-cooled sealed baseline at the same 300W sustained load.
Time to reach full thermal equilibrium after submersion. Air-cooled baseline never reached equilibrium, temperatures were still rising when the test was terminated.
Effective PUE during submerged operation. Zero mechanical cooling of any kind was used at any point in the test. All heat rejection was passive and thermodynamic.
| Measurement | Test 1: Sealed / Air | Test 2: Lake Submerged | Delta |
|---|---|---|---|
| Ambient temp | 58°F air | 40°F water | , |
| Bulk fluid temp | 110°F (rising ↑) | 60°F (stable ✓) | −50°F |
| Enclosure wall temp | 95°F (rising ↑) | 46°F (stable ✓) | −49°F |
| Lid temp | 107°F (rising ↑) | 50°F (stable ✓) | −57°F |
| Thermal equilibrium | NOT reached | < 1 hour ✓ | , |
| Mechanical cooling | None | None | Same |
The immersion cooling market is real and growing, Trane Technologies acquired LiquidStack in February 2026 for ~$85B in enterprise value, validating the category. But every existing solution still requires pumps, CDUs, and mechanical infrastructure. Submera is the only architecture that eliminates them entirely.
| Category | Submer | LiquidStack | GRC | Direct-to-Chip | Submera |
|---|---|---|---|---|---|
| Pumps / CDUs | Yes | Yes (CDU) | Yes (CDU) | Yes (CDU) | NONE |
| Fans required | No | No | No | YES (partial) | NONE |
| Facility cooling | CDU + loop | CDU + tower | CDU + loop | CDU + CRAC | NONE |
| PUE | 1.03–1.05 | 1.02–1.03 | 1.02–1.05 | 1.03–1.10 | 1.005–1.04 |
| CapEx / kW | $3K–$8K | $5K–$12K | $3K–$6K | $1.5K–$4K | ~$1K–$2K |
| PFAS exposure | None | HIGH | None | None | ZERO |
| Water use | Varies | Varies | Varies | Varies | ZERO |
| Moving parts | Multiple | Multiple | Multiple | Multiple | ZERO |
The data center cooling market is one of the fastest-growing infrastructure segments in the world, driven directly by AI compute density growth. Submera is positioned at the intersection of immersion cooling adoption and passive architecture, a category with no current direct competitors.
22.3% CAGR
20.1% CAGR
Years 1–5 build
Trane Technologies (~$85B) acquiring LiquidStack, February 2026
Schneider Electric acquired Motivair for ~$850M, October 2024
Samsung acquired Flak Group for $1.5B to enter DC cooling, May 2025
AWS launched proprietary liquid cooling for GPU racks, July 2025
Top 4 hyperscalers: $290B+ combined AI/DC CapEx in 2025
AI rack density now 40–120 kW, air cooling physically insufficient at frontier
Submera's business model is sequenced for capital efficiency, the same hardware that validates the technology generates the first revenue, funds the next build, and establishes the track record for product sales and IP licensing at scale.
Submera operates the deployed units directly and rents GPU compute time to enterprise AI teams, researchers, and inference providers. Because our cooling costs nothing to run, operating expenses are a fraction of traditional data centers, letting us offer competitive pricing while keeping strong margins. Compute revenue funds the next deployment, which funds the one after.
Submera leases pond surface area from private landowners with lakes, ponds, or large water features on their property. The model mirrors the cellular and radio tower industry: a flat-rate annual payment, priced by surface area, in exchange for hosting infrastructure that the owner never has to operate. This is how Submera scales nationally without ever buying real estate.
Submera's execution plan is sequenced to reach GPU-class thermal validation and first compute revenue within 12 months of funding close, then scale into multi-site deployments through landowner partnerships during the second year.
Procure 4× H100 PCIe GPUs and CNC tooling. Fabricate V2 enclosure with precision thermal interface. Seal and fill with dielectric fluid.
Deploy V2 in a candidate pond. Run thermal validation at 1.5–2.5 kW GPU-class load. Collect 90 days of production temperature data across the full unit array.
V2 transitions from validation to production. First compute rental revenue. Scale the initial pond toward full unit count. Refine deployment playbook for replication.
Sign first landowner partnership leases. Deploy a second pond pair on private acreage under the lease model. Build the multi-site pipeline that defines the next phase of growth.
Funding close, hardware procurement begins immediately
V2 enclosure assembled, sealed, and fluid-filled
First pond deployment, thermal testing begins
Thermal validation complete at 1.5–2.5 kW GPU load
First compute revenue, V2 transitions to production
First landowner partnership lease signed
Second pond pair deployed on partnered acreage
Multi-site cluster operational, partnership pipeline active
Submera is actively working to reshape how the world thinks about data centers, moving compute out of massive, power-hungry buildings and into the natural environment around us. Efficient by design. Out of sight by nature. If that mission resonates with you, we'd love to connect.