Artistic rendering of the Anti-Submarine Warfare (ASW) Continuous Trail Unmanned Vessel (ACTUV) designed to keep track of the diesel electric submarine movements, including the latest quiet boats.
Defense Advanced Research Projects Agency
<a rel="nofollow" class="external free" href="https://www.darpa.mil/program/anti-submarine-warfare-continuous-trail-unmanned-vessel">http://www.darpa.mil/program/anti-submarine-warfare-continuous-trail-unmanned-vessel</a> Archived at: <a rel="nofollow" class="external free" href="https://archive.is/MQ5vl">https://archive.is/MQ5vl</a>