The disastrous collapse that left six people presumed dead and took out one of the region’s key infrastructure links after a container ship, the Dali, slammed into Baltimore’s Francis Scott Key Bridge wasn’t the first such occurrence. Four decades ago, another container ship also lost power and hit the same bridge — but the bridge stood strong. Some experts doubt whether any feasible protective structure could have saved the bridge from a head-on strike from a ship as big as the Dali. But Barzin Mobasher, a structural engineering professor in the School of Sustainable Engineering and the Built Environment, part of the Fulton Schools, says fact that the Key Bridge was hit twice by shipping vessels in 40 years should have led officials to take stronger safety precautions.

See also: The key factors that contributed to the Baltimore bridge collapse, KOAM News Now, CCN ESEuro and later edition update by CNN.

How to Understand the Baltimore Bridge Collapse, New York magazine, March 31