An aerial view of the ND-40, a maintenance barge belonging to the U.S. Army Corps of Engineers Nashville District, from the top of the main chamber at Wilson Lock in Florence, Ala., Oct. 9, 2024. The barge serves as a base of operations for dive-certified district lock mechanics as well as operators of a Remotely-Operated Vehicle (ROV) visiting from the USACE Engineer Research and Development Center (ERDC). The power cable connecting the ROV to the barge is visible in the upper-right corner of the photo. (USACE Photo by Jeremy Croft)