Microsoft begins next phase of Project Natick by submerging a data center off Scotland's coast, where it is designed to work without maintenance for five years
Microsoft kicked off the second phase of its experimental underwater data center project Wednesday, submerging …
Context & Ripple Effects
Project Natick has been public since Microsoft first described it as a self-contained underwater data center meant to eliminate cooling costs and shorten deployment time in its 2016 announcement. This deployment off Scotland is the project moving from concept to a full-scale endurance test: a sealed vessel designed to run five years without a single maintenance visit.
What makes this phase matter beyond the experiment itself is what followed it — Microsoft later declared the Orkney deployment a success after retrieving it in 2020, and Chinese operator Hailanyun went on to build a $223M wind-powered underwater facility near Shanghai on technology Microsoft pioneered, evidence the idea escapes the lab.
First-order effects
- Microsoft gains a live testbed for its core thesis: ocean water as free cooling and a factory-sealed vessel that trades repairability for deployment speed, with no on-site staff or maintenance contract for five years.
- Scotland's Orkney Islands become the proving ground for whether cloud capacity can be sited offshore rather than in land-constrained, power-hungry industrial corridors.
Second-order effects
- If the sealed-vessel model holds, hyperscale siting logic shifts toward coastlines near population centers, pressuring rivals to answer with their own alternative-cooling programs rather than conventional builds.
- Suppliers of marine-grade enclosures, subsea cabling, and renewable interconnects gain a new customer category as data center hardware moves into the ocean domain.
Third-order effects
- Hailanyun's later wind-powered underwater center near Shanghai shows the pattern already materializing: subsea data centers graduating from Microsoft's research project into commercial infrastructure built by others.
- Combined with Microsoft's subsequent push toward zero-water and drastically reduced water cooling, the trajectory points to an industry where thermal design — not land or chips — becomes the differentiator in where and how capacity gets deployed.
The trend: Data center infrastructure is decoupling from traditional terrestrial sites, with ocean-based and radically water-efficient designs moving from experiment to commercial deployment.