The Sea Hunter is an autonomous unmanned surface vehicle (USV) launched in 2016 as part of the DARPA Anti-Submarine Warfare Continuous Trail Unmanned Vessel (ACTUV) program. It was christened 7 April 2016 in Portland, Oregon.
The initially unarmed prototype, built at a cost of twenty million dollars, is a 132-foot (40 meter)-long trimaran (a central hull with two outriggers). It is an unmanned self-piloting craft with twin screws, powered by two diesel engines with a top speed of 27 knots (31 mph; 50 km/h). Its weight is 135 tons, including 40 tons of fuel, adequate for a 70-day cruise.
It is expected to undergo two years of testing before being placed in service with the U.S. Navy. If tests are successful, future such craft may be armed and used for anti-submarine and counter-mine duties, operating at a small fraction of the cost of operating a destroyer, $15,000-$20,000 per day compared to $700,000 per day.
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 Sea Hunter – US Navy New Type Vessel){kind=link}