180805-N-GO855-0020 SAN DIEGO (Aug. 5, 2018) Space and Naval Warfare Systems Center Pacific (SSC Pacific) hosts the finals of the 21st annual RoboSub competition, an international robotics competition held at SSC Pacific's six-million gallon transducer evaluation center in San Diego. (U.S. Navy photo by Mass Communication Specialist 1st Class Charles E. White/Released)