A survey vessel removes trees and other debris near the site of the sunken slave ship Clotilda in the Mobile Harbor near Africatown in Mobile, Alabama, May 4, 2022. The Clotilda was the last known slave ship to enter United States waters with captives more than 50 years after the practice was banned by Congress. The Mobile District is working with the Alabama Historical Commission and other stakeholders to locate and preserve this vessel of historical significance (Courtesy photo)