China's Global Times reported on April  that the US military plans to deploy ASW Continuous Trail Unmanned Vessels (ACTUV) that can detect and track submarines in Autumn in response to potential threats from Russian and Chinese submarines. The 132-foot long unmanned submarine, which was developed by the Defense Advanced Research Projects Agency under the US Department of Defense, has the ability to stalk quiet, modern diesel-electric submarines. It passed tests carried out by the agency in the Mississippi River in March. During a 35 nautical-mile run in the river, the vessel was tested under 100 different scenarios and passed them without bumping against rocks, reef and other ships and boats in the water. The vessel will be tested again to see if its tracking system can detect and track submarine targets one kilometer away.