Submarines have evolved over the years in so many ways, that’s impossible to note them all. With these advances, submarines have been coming widely available to some second and third world countries. As not all countries are America’s friends, the Defense Advanced Research Projects Agency (DARPA), has decided to invent a submarine tracker. This tracker is called an Anti-Submarine Warfare (ASW) Continuous Trail Unmanned Vessel (ACTUV). In other words, no human intervention is required for the ACTUV to locate and trial submarines. The project will hopefully be completed by 2015, which would free the US Navy’s resources.