The growing number of adversaries able to build and operate quiet diesel electric submarines is a national security threat that affects U.S. and friendly naval operations around the world. To address this emerging threat, DARPA recently awarded a contract for Phases 2-4 of its Anti-Submarine Warfare (ASW) Continuous Trail Unmanned Vessel (ACTUV) program to Science Applications International. During Phases 2-4 the ACTUV program will attempt to design, construct and demonstrate an unmanned vessel that tracks quiet diesel electric submarines for months at a time spanning thousands of kilometers of ocean with minimal human input. Source: Naval Open Source INTelligence