April 7, 2016 - Sea Hunter, an entirely new class of unmanned ocean-going vessel gets underway on the Williammette River following a christening ceremony in Portland, Oregon. Part the of the Defense Advanced Research Projects Agency (DARPA)'s Anti-Submarine Warfare Continuous Trail Unmanned Vessel (ACTUV) program, in conjunction with the Office of Naval Research (ONR), is working to fully test the capabilities of the vessel and several innovative payloads, with the goal of transitioning the technology to Navy operational use once fully proven. (U.S. Navy photo by John F. Williams)