January 7, 2026
As 2025 came to an end, HII engineers and technicians in Pocasset, Massachusetts, celebrated the completion of production of the 42nd Lionfish small unmanned underwater vehicle (SUUV) for the U.S. Navy. This milestone represents the final base-year Lionfish to be delivered under a five-year program that could scale to 200 vehicles, with a total contract value exceeding $347 million.
Lionfish is based on HII’s REMUS 300 platform, a modular, open-architecture SUUV engineered for multi-mission adaptability. The platform was developed in collaboration with the U.S. Navy and the Defense Innovation Unit (DIU) to accelerate the adoption of dual-use commercial technologies into U.S. Department of Defense programs.
HII delivered the first two Lionfish vehicles in April of this year.
The Lionfish program has been recognized as the U.S. Navy’s first successful transition from an Other Transaction Authority (OTA) prototype to full-scale production. Lionfish is also the first, and only, cyber-compliant unmanned underwater vehicle.
HII is a global, all-domain defense provider. HII's mission is to deliver the world's most powerful ships and all-domain solutions in service of the nation, creating the advantage for our customers to protect peace and freedom around the world.
As the nation's largest military shipbuilder, and with a more than 135-year history of advancing U.S. national security, HII delivers critical capabilities extending from ships to unmanned systems, cyber, ISR, AI/ML and synthetic training. Headquartered in Virginia, HII's workforce is 44,000 strong.
Sign Up for Updates
Enter your email to receive news updates and insights.
By subscribing you agree to our Privacy Policy and provide consent to receive updates from HII.