The U.S. Navy has successfully trialed a cutting-edge, self-driving submarine drone, dubbed the “Manta Ray,” which can hibernate on the ocean floor for extended periods without refueling, reported the New York Post.

The trials were conducted off the shores of Southern California in February and March, showcasing the full-scale capabilities of the Northrop Grumman-developed Manta Ray prototype.

Kyle Woerner, program manager for Manta Ray at the Defense Advanced Research Projects Agency (DARPA), hailed the tests as a milestone affirming the vehicle’s readiness for real-world missions.

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