Bubble Robotics Raises $5M Seed Seed for Autonomous Ocean Robots

A British-backed robotics startup that promises to replace aging coastal ships and crews with underwater machines has landed $5m (£3.95m) in pre-seed funding, signaling a new investor appetite for so-called “physical AI” targeting the world’s most stubborn analogue.

Bubble Robotics, founded in 2025 by former NASA and ETH Zürich engineers, has received a round from Episode 1 Ventures, Asterion Ventures and Norrsken Evolve, following its investment by London-based talent investor Entrepreneur First. The company is already sitting on more than $4m in signed letters of intent across offshore wind, subsea infrastructure and maritime security, suggesting commercial traction is well ahead of the pre-seed playbook.

The pitch is straightforward, if ambitious. Today, inspecting an offshore wind turbine, a buried data cable or a section of subsea pipeline often requires a chartered vessel, professional crews and a daily fee that can run up to $100,000. According to Bubble’s founders, between 80 and 90 percent of those costs are tied to the boat and the people on it, instead of checking it yourself.

“By removing that dependency, we are opening a step change in cost, safety and operational frequency,” said Jean Crosetti, CEO and co-founder. “What used to be episodic is becoming an ongoing thing.”

The plan is to do away with ship-based work entirely and instead use a fleet of sea-dwelling robots that stay at sea for months at a time, continuously surveying, monitoring and collecting data without human intervention. Crosetti likens the model to satellite constellations that have revolutionized Earth observation over the past decade, pointing only down into the water column rather than up into space.

Time marks a broad inflection point. Cheaper edge computing, better on-device AI and the rapid expansion of low-Earth satellite connectivity, among others, have made persistent unmanned operations possible in a way that was not even possible three years ago. The macro pull is equally important: the offshore energy sector alone is predicted to need an additional 600,000 workers by 2030, a shortfall that no degree scheme will cover in time.

Bubble sells its capabilities on a robotics-as-a-service basis, sparing customers the up-front capital costs and overseas integration costs that often lock smaller operators out of high-frequency inspection regulations. Target use cases include inspection of wind turbine foundations, cables, pipelines and subsea structures; benthic mapping, photogrammetry and biofouling monitoring for climate and biodiversity clients; and mine countermeasures, explosive ordnance detection and ongoing surveillance of defense and maritime security brokers.

That last category is becoming more and more effective. Recent incidents involving submarine data cables in the Baltic and North Sea have pushed the security of underwater infrastructure high on the agenda of European governments and Nato, revealing how much of it is still being monitored. Persistent autonomous systems provide a way to maintain a continuous presence around critical assets without making sea resources scarce.

Alice Bentinck, who is the founder of Entrepreneur First, said that the founders stood out from the moment they met at one of the company’s startup weekends. “Patricia and Jean have built a team with the same belief and complementary skills: Patricia with world-class technological confidence in robotics, Jean with extraordinary commercial sense and energy. Their speed of iteration throughout the system and strong passion for customers make Bubble Robotics a company to watch closely.”

In the broader SME ecosystem, Bubble’s evolution is a useful data point. It suggests that capital is still flowing into deep technology startups with reliable commercialization, just as predictive AI is playing well, and that the long-promised convergence of robotics, AI and connectivity is finally producing businesses with attached revenue lines, not just demos.