The U.S. Army Corps of Engineers on Wednesday released striking new 3D sonar images that capture an underwater view of the debris from the collapsed Francis Scott Key Bridge in Baltimore. The bridge, which is mostly intact underwater in Baltimore's harbor, demonstrates the challenges ahead for the U.S. Army Corps of Engineers as it moves forward with plans to reopen a shipping channel at that location in May. The dramatic color images taken Tuesday by a CODA sonar system show large portions of the bridge's arched steel beams lying below the water's surface.