Keith Millstine, a member of the U.S. Army Corps of Engineers Pittsburgh District dive program, operates a VideoRay PRO 5, an underwater remote operated vehicle (ROV), using a controller during a three-day training event at a lock and dam facility on the Allegheny River in Natrona, Pennsylvania, Sept. 22, 2021. This ROV model is new to the Pittsburgh District, equipped with a high-definition video and photo camera, a multibeam sonar, a claw that can rotate and grab objects, and thrusters that are twice as powerful as the previous version to pilot through stronger currents. (U.S. Army Corps of Engineers photo by Michel Sauret)