Baltimore Bridge Collapse: What We Know About NTSB Report and Recovery

Federal investigators said on Tuesday that the giant cargo vessel that brought down the Francis Scott Key Bridge in Baltimore on March 26 had suffered two electrical blackouts in the hours before it left the port.

Though the release of the preliminary findings from the National Transportation Safety Board offered some fresh insight into the catastrophic collapse, much still remains unknown about the cause of the ship’s problems.

On Wednesday, lawmakers are expected to press the N.T.S.B.’s chair, Jennifer Homendy, for more answers when she testifies before the House transportation and infrastructure committee.

Here’s what we know about the disaster, the nation’s deadliest bridge collapse in more than a decade.

The N.T.S.B. report indicated that the 985-foot-long cargo vessel, the Dali, had been suffering power problems before it left the Port of Baltimore, and experienced at least two electrical failures on the day before the accident. Those failures led the crew to adjust the configuration of the electrical system about 10 hours before setting out.

Then while leaving the port, the Dali had a “complete blackout” that knocked out power to the engine and the navigation equipment, early on March 26. The ship issued a mayday call just before hitting a critical support for the bridge.

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