The USX-1 Defiant, the first unmanned surface vessel (USV) designed from the ground up with no need for a human crew, has officially begun its extended at-sea demonstration, showcasing endurance and reliability. Part of DARPA’s No Manning Required Ship (NOMARS) program, Defiant eliminates all human-centered design constraints to optimize for size, cost, hydrodynamics, and survivability. Launched from Port Angeles, Washington, and now in the Pacific Ocean, the 180-foot, 240-metric-ton vessel represents a major step toward a future hybrid fleet of manned and unmanned ships. Designed for resilience in high sea states and maintainability in conventional shipyards, Defiant is redefining naval engineering. DARPA writes:

Defiant sets sail

September 4th, 2025 – The USX-1 Defiant has set sail, beginning her extended at-sea demonstration of endurance and reliability. She completed pre-departure testing in the waters near Port Angeles, Washington, before sailing up the Strait of Juan de Fuca. The ship reached the Pacific Ocean early this morning.

Meet a first-of-its-kind unmanned ship

The No Manning Required Ship (NOMARS) program has built an unmanned surface vessel (USV) designed from the ground up to never accommodate a human aboard, the USX-1 Defiant.

By removing the human element from all ship design considerations, the program intends to demonstrate significant advantages, to include: Size, cost, at-sea reliability, greater hydrodynamic efficiency, survivability to sea-state, and survivability to adversary actions.

NOMARS is the kind of experimentation that could define a future hybrid maritime fleet, a manned-unmanned team with the ability to adapt and scale.

Bookmark this page to follow along as Defiant undergoes an extended at-sea demonstration of reliability and endurance, showcasing what’s possible when we rethink how we design, build, operate, and maintain ships.

Read more here.