The U.S. Navy is pushing its stealth mine-laying robot submarine closer to operational service, exercising a $13.97 million contract modification with General Dynamics Mission Systems on July 6, 2026 for the next phase of the Mining Expendable Delivery Unmanned Submarine Asset — MEDUSA.
A torpedo-tube robot for offensive mining
MEDUSA is an expendable unmanned underwater vehicle roughly the size of a torpedo, designed to launch from a Navy submarine's torpedo tube and then travel autonomously to deliver a mine payload well away from the launching platform. Because the vehicle is expendable, the launching submarine can leave the area immediately instead of lingering for recovery — an important stealth advantage in contested waters. Work under the new modification runs through July 2028 at General Dynamics facilities in Quincy and Taunton, Massachusetts.
Asymmetric answer to a bigger navy
Naval planners see offensive mining as a way to deny an adversary access to key waterways without matching the People's Liberation Army Navy ship for ship. MEDUSA lets submarines extend that stealth advantage into the offensive mine warfare role while staying hidden. The scope of the new mod adds prototype systems, software development, shore-based support equipment and engineering services.
Contract structure and roadmap
General Dynamics Mission Systems first won the MEDUSA award in September 2024 at $15.9 million, with options that could push total value to $58.1 million through 2032. The company reported completing risk-reduction testing off Massachusetts by January 2026, validating propulsion, navigation and autonomy behaviours. The Navy's PMS 406 Unmanned Maritime Systems office is overseeing the effort, with Navy sailor evaluations planned once the system matures.
Fits into a broader undersea portfolio
MEDUSA is one of several underwater munitions and vehicles General Dynamics builds for the Navy, including the moored, encapsulated Hammerhead torpedo mine. The company has said MEDUSA could also integrate with larger platforms such as Boeing's 50-ton Orca extra-large unmanned underwater vehicle, extending its reach beyond torpedo-tube launch.
Reporting based on coverage from The Defence Blog and Naval News.