Video: SONAR Deployed to Find Debris After Key Bridge Collapse

The U.S. Army Corps of Engineers says beginning on Wednesday crew members used sonar equipment to determine the location of debris and search for submerged vehicles from the collapsed Francis Scott Key bridge. Eight construction workers were filling potholes on the bridge when the crash happened. Two were rescued soon after the collapse. Divers recovered the bodies of two others, and the other four are presumed dead. Source: US Army Corps of Engineers via US Dept of Defense via Associated Press