Ty Melton, a lock mechanic with the U.S. Army Corps of Engineers Nashville District, dons diving headgear with the help of Matt Williamson, a fellow mechanic at Wilson Lock in Florence, Ala., Oct. 9, 2024. Dive-certified mechanics like Melton and Williamson are crucial to getting a firsthand look at any underwater maintenance concerns, such as the cracks in the land and river sides of the gates at Wilson that have caused the closure of the main chamber.