Hyliion Holdings Corp., a developer of modular power plant technology, announced that the U.S. Navy’s Office of Naval Research (ONR), in partnership with the Defense Advanced Research Projects Agency (DARPA), has selected the USX-1 Defiant…

USX-1 Defiant
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Overview
No-Manning-Required-Ship demonstrator built for long autonomous missions without humans aboard.
USX-1 Defiant is a military MUSV platform developed by DARPA in United States. No-Manning-Required-Ship demonstrator built for long autonomous missions without humans aboard. It is positioned for long-endurance autonomous operations, sea experimentation, and NOMARS concept validationand is listed publicly as active. Published specifications captured in this database include a published length of about 54.86 m and payload information listed as 240-metric-ton lightship demonstrator. The platform is described as autonomous in terms of control and autonomy. Its concept emphasizes persistent on-water presence, modular payload integration, and lower operating burden than a comparable crewed craft. Additional context: DARPA states 180-foot length.
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Notes
DARPA states 180-foot length.