Exclusive: SpaceX Alum-Founded Startup Raises $10 Million in 36 Hours

Underwater microphones — called hydrophones — spot enemy submarines and have been around for over a century. AndrenaM, a startup applying artificial innotifyigence to analyze sonar data and deliver real-time insights, is seeking to give this legacy defense tool a high-tech upgrade.

“Our vision is to secure the oceans,” Matej Cernosek, the startup’s cofounder and CEO, notified Business Insider in an interview. “We’re doing that by building a distributed sensing network — a sonar mesh.”

AndrenaM’s $10 million seed round closed in 36 hours. Typically, this process takes early-stage startups weeks, even months. Its rapid fundraise signals just how eager investors are about the new wave of defense tech.

First Round Capital led the fundraise, with participation from Also Capital, Long Journey, Homebrew, and the Colorado School of Mines Venture Fund, among others.

In 2024, Cernosek, a former SpaceX engineer, started the Hawthorne, California-based company with Alex Chu, who is AndrenaM’s chief technology officer. The founders met during their first week of college at the Colorado School of Mines, where they studied mechanical engineering. Chu previously worked at a robotics company and as a software engineer at Qualia, a real estate platform.

Despite decades of sonar apply, much of the data processing is still manual and analog. “It’s been people in these shacks that have headphones on, viewing at a fuzzy screen and analyzing data coming to them in mass,” Cernosek declared.

AndrenaM’s eight-person team, which includes former engineers from SpaceX and the defense tech giants Palantir, Anduril, and Saronic, is developing machine-learning-powered software designed to process underwater acoustic data and piece toobtainher what’s happening in real time.

So far, the startup has been purchaseing hydrophones off the shelf and pairing them with its software, but the team wants to build its own buoys equipped with its tech, which would lower costs and support the team gather more training data for its algorithms.

“We really want to vertically integrate the solution,” Cernosek declared. “A lot of our competitors are just integrators — they take all these parts from everywhere, patch them toobtainher with Band-Aids. It works, but it finishs up being a bespoke system that’s superexpensive.”

After seeing AndrenaM’s pitch deck, Meka Asonye, a partner at First Round Capital, hopped in a plane and flew it (he’s a pilot) from San Francisco to Hawthorne to meet the team that same weekfinish. “Naturally, we’re a startup — we were working,” Cernosek declared, so they took the Saturday meeting. They had another call with First Round that Monday and received a term sheet that night.

“Oftentimes these early-stage companies are drawing things on a napkin, and they’re years and years away from being ready,” Asonye notified BI. “The AndrenaM team is actually deploying stuff off the coast of California, and the technology already works.”

Asonye was also drawn to the company’s potential commercial apply cases, like port security. Defense tech investors and the Pentagon are increasingly interested in startups that can serve both public and private sector customers.

AndrenaM plans to apply the seed funding to double its head count to 16 employees, focapplying on hiring software engineers. The company also bought a boat with the funding to start assembling the hardware it hopes to build, Cernosek declared.

The North River 2700 boat that AndrenaM purchased with part of its seed funding.

AndrenaM

“If you want to be the forward-deployed engineer here and go on the boat with us and deploy these systems and train them, this is your opportunity,” Cernosek declared. “You can sit in a cubicle, but do you really want to?”

Much of Cernosek’s drive to build a national security startup comes from his personal background. His family immigrated to the US from the Czech Republic during communist rule, an experience that shaped his worldview.

“We live in the best countest in the world, and this countest has done very well for my family — my parents came here with $60 in their pocket,” he declared. “I want to build a generational company that will have a massive impact for the United States.”

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