Drones Beware: New Sonar Hunts Underwater Threats

The modern naval landscape is increasingly challenged by a swarm of small, diverse underwater drones, posing a significant threat to critical infrastructure. Ultra Maritime has introduced an innovative approach to counter this menace by integrating its Sea Spear passive sonar array with the AN/SSQ-125B active sonobuoy. This combination, showcased during the US Navy's Lanternfish 2026 exercise, proved adept at detecting and tracking unmanned underwater vehicles (UUVs) of varying sizes and sophistication.

While the individual components—passive listening and active pinging—are decades-old technologies, their strategic integration within a distributed architecture creates a powerful new capability. This system, working in conjunction with platforms like Anduril's Seabed Sentry and connected to Navy command systems, generates precise, usable data. It allows for the detection and alerting of potential hostile naval assets, enhancing situational awareness.

This development comes as defense contractor Lockheed Martin is set to acquire Ultra Maritime for $3.45 billion. The timing is opportune, as navies worldwide grapple with identifying and neutralizing the persistent threat posed by underwater drones, making Ultra Maritime's dual-pronged sonar strategy a compelling solution.