History and Background

OceanTherm AS was founded by Olav Hollingsæter, a retired officer who served 38 years in the Norwegian Armed Forces and NATO, including extensive service aboard submarines. The foundational concept emerged following the devastation wrought by Hurricane Katrina in 2005. Hollingsæter recognized that warm sea surface temperatures were the primary fuel source causing the storm to rapidly intensify before making landfall. Drawing on his background as a submariner, he knew that ocean water temperatures drop significantly at lower depths.

Although Norway has utilized localized bubble curtain technology for over 50 years to keep coastal fjords free of ice during winter months, applying this technology at extreme ocean depths to alter ocean thermodynamics for storm mitigation was unprecedented.

In 2017, Hollingsæter partnered with his brother, Bjørn Hollingsæter, an industrial economist, to formally incorporate OceanTherm AS. The company secured funding from Innovation Norway and the Research Council of Norway, initiating a research partnership with SINTEF Ocean, one of Europe's largest independent research organizations. Grim Eidnes, a senior scientist at SINTEF who served as principal investigator on the initial feasibility studies, subsequently joined OceanTherm as Chief Scientific Officer.

Core Technology and How It Works

The Mechanics of the Bubble Curtain

Tropical cyclones absorb massive thermal energy from the top layer of the ocean. OceanTherm’s solution intervenes directly in this thermodynamic exchange using submerged bubble curtains:

1. Submerged Pipe Deployment: Perforated distribution pipes are lowered to ocean depths ranging between 50 and 100 meters.
2. Compressed Air Injection: Industrial compressors pump compressed air down through the piping system.
3. Artificial Upwelling: As compressed air escapes through the perforations, the rising bubble plume entrains the surrounding deep, cold ocean water.
4. Thermal Surface Mixing: The ascending plume carries the deep cold water up into the warm surface layer. Upon reaching the surface, the cooler water mixes with the warm upper layer, dropping sea surface temperatures (SST) below the critical 26.5 °C threshold.
5. Storm Diffusion: Natural ocean currents help disperse the cooler water across a wide area directly in the projected path of an incoming storm system, lowering the storm's intensity or preventing a tropical depression from developing into a major hurricane.

Technology Advantages

• Subsurface Resilience: Because the piping array operates tens of meters beneath the water's surface, the system remains unaffected by surface waves and high-velocity storm winds.
• Non-Obstructive: Submerged installation ensures shipping lines and maritime traffic can pass freely overhead without operational interruption.
• Reversibility: The physical effect is localized and temporary; once compressor operation ceases, normal ocean mixing processes naturally restore surface temperatures over time.

Products, Services, and Operational Concepts

While OceanTherm is transitioning through field-validation stages toward commercial deployment, its operational model encompasses specific technology offerings, engineering services, and deployment configurations:

1. Offshore Mitigation Systems (Stationary & Mobile Arrays)

• Narrow Strait & Coastal Barriers: Stationary underwater arrays installed across geographic choke points—such as the Yucatan Channel, the Straits of Florida, or narrow coastal corridors—where tropical storms routinely pass before making landfall.
• Mobile Fleet Arrays: Dynamic offshore configurations where specialized vessels equipped with compressors deploy and tow flexible bubble pipe systems directly into the paths of developing storm systems in open ocean waters.

2. Oceanographic Simulation & Numerical Modeling Services

In partnership with research institutions like SINTEF, OceanTherm provides advanced computer modeling and fluid dynamic simulations. Using coupled gas-ocean models (such as SURE and SINMOD), the company models local ocean thermal layers, currents, and plume dispersion rates to calculate the precise length, depth, and air volume required for effective surface cooling in specific geographic zones.

3. Engineering, Design, and Feasibility Studies

OceanTherm offers custom ocean engineering assessments for coastal municipalities, regional governments, insurance conglomerates, and offshore industrial operators (such as oil/gas platforms and offshore wind installations). These studies evaluate: * Local thermocline dynamics and target deployment depths. * Compressor power requirements and carbon offset balances. * Environmental impact assessments regarding local marine flora and fauna.

R&D Milestones and Proof of Concept

OceanTherm has systematically validated its technology through scientific modeling and physical trials:

• Deepwater Field Testing (Vanvikan, Norway): OceanTherm executed deepwater trials at a depth of 50 meters in Norwegian waters. Using aerial drone thermal imaging and submerged sensors, the pilot project verified that the bubble plume effectively entrained deep water, reducing sea surface temperatures by at least 3.5 °C at the test location.
• Virtual Proof of Concept (VPoC): In collaboration with SINTEF, OceanTherm completed numerical simulations demonstrating that strategically deployed bubble curtains can successfully reduce large-scale sea surface temperatures to below 26.5 °C, with current-driven dispersion extending the cooling zone across targeted ocean corridors.
• Scalability Trials: Subsequent engineering efforts have focused on extending deployment depths to 100 meters and designing lightweight, high-tensile piping systems suitable for rapid deployment in open ocean conditions.

Environmental and Economic Considerations

Ecological Impact

According to company assessments and scientific partners, the artificial upwelling mechanism relies entirely on mechanical movement via air injection, without the addition of chemicals or foreign agents. Baseline studies indicate minimal disruption to sea life, with independent ecological impact evaluations planned prior to full-scale commercial deployments.

Energy and CO2 Footprint

The primary power consumption of an OceanTherm deployment stems from running industrial air compressors. Operations are event-driven, typically limited to the active duration of an approaching storm (estimated at approximately 20 operational days per year). The company's analysis indicates that the societal and environmental costs associated with the compressor emissions represent a negligible fraction of the avoided economic devastation, infrastructure loss, and carbon footprint resulting from major hurricane damage.