The operators of the Dali cargo ship issued a mayday call that the vessel had lost power moments before the crash, but the ship still headed toward the span at “a very, very rapid speed," Maryland governor Wes Moore said. The 985-foot-long (300-meter-long) vessel struck one of the 1.6-mile (2.6-kilometer) bridge’s supports, causing the span to break and fall into the water within seconds.

Source: How a $3m structural 'flaw' led to collapse of Baltimore bridge