Online Oceans Raises $5m for Maritime Defense Autonomous Surface Fleets

Online Oceans, a UK company building autonomous surface vessels and fleet software for defense and maritime security, has raised USD$5.4 million (£4 million) in funding led by Seraphim Space. The round also includes participation from investors, including Peter Rive, co-founder of SolarCity, Frank Thieser and Florian Seibel, founders of Quantum Systems, and Koro Capital.

At the center of the company’s offering is Scout, a compact solar-powered autonomous surface vessel designed for persistent deployment at scale. Scout is paired with Tether, Online Oceans’ cloud-based command-and-control platform, which allows operators to manage missions, monitor assets and access data in real time. Together, they give governments and commercial customers a practical way to move from occasional, high-cost missions to persistent maritime coverage at scale, while also creating the foundation for recurring software and data revenues.

Maritime security is becoming more urgent as governments and operators face rising pressure to protect critical waters, monitor strategic chokepoints and secure subsea infrastructure. Yet, persistent coverage remains prohibitively expensive with existing systems. Existing approaches rely on crewed vessels with high operating costs or autonomous systems too expensive to deploy in dense fleets, making coverage intermittent rather than continuous. Online Oceans has designed its system from the outset