U.S. Navy Diver 2nd Class Andrew Bui, with Space and Naval Warfare Systems Center Pacific, recovers an autonomous underwater vehicle (AUV) built by students from Cornell University after navigating through an obstacle course at the Transducer Evaluation Center's anechoic pool in San Diego July 24, 2013, during RoboSub 2013. RoboSub is an annual event co-sponsored by the Association for Unmanned Vehicle Systems International Foundation and the U.S. Office of Naval Research to advance the development of AUVs.