US Navy's SeaGuardian drone hunts hidden submarines using sonobuoys

General Atomics Aeronautical Systems, Inc. (GA-ASI) has advanced unmanned maritime patrol capabilities by testing its MQ-9B SeaGuardian drone equipped with a new Expanded Sonobuoy Dispensing System (ESDS). Conducted in December, these tests enhanced the drone’s ability to detect submarines deep underwater by deploying a larger number and variety of sonobuoys, including Multi-static Active Coherent (MAC) buoys—a first for uncrewed aircraft. This technology addresses the critical need for extended submarine detection missions, as traditional manned aircraft like helicopters and P-8A Poseidons have limited flight durations that strain crews during prolonged operations. Submarine detection remains vital due to the strategic threat posed by nuclear and conventional submarines, which can disrupt global security and commerce. Sonobuoys, small sensor pods deployed in the ocean, are key tools for locating submarines. The MQ-9B SeaGuardian’s ability to stay airborne longer and carry twice as many sonobu