Researchers from the U.S. Army Engineer Research and Development Center (ERDC), the U.S. Army Corps of Engineers and the U.S. Geological Survey worked together to service a prototype underwater acoustic deterrent system (uADS) at Lock No. 19 in Keokuk, Iowa, April 2023. ERDC Environmental Laboratory researcher Jesyca Jarabica draft in-air acoustic technical methods. (U.S. Army Corps of Engineers photo by Christa Woodley)