For 47 years, the Francis Scott Key Bridge stood as the gateway to the Port of Baltimore and a landmark as one of the longest steel truss bridges ... collapse are 35-year-old Alejandro Hernandez ...

Teams are challenged to design, fabricate and construct their own one-tenth-scale steel bridge in the shortest time and under specific building constraints that reflect real-life structural ...

On Thursday, the first of six planned explosions of portions of the old eastbound span ... using explosives to sever the steel because dismantling a truss bridge would require extensive falsework ...