Investigators responding to the shipping accident that destroyed the Francis Scott Key Bridge in Baltimore faced a needle-in-a-haystack search. An electrical failure had caused the 9,971-teu Dali (built 2015) to lose power just three ship lengths from the bridge.

But the ship’s thousands of wires stretch for miles. Which one caused the problem? In the fourth episode of our Marine Investigation series about the deadly incident, Wavelenth Plus explores the hunt for this fault, which National Transportation Safety Board chair Jenifer Homendy compared to searching for a loose bolt on the Eiffel Tower.

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