Scott Mascione

The NTSB's final report says a wire pulling loose over time from the cargo ship Dolly's breaker caused two blackouts on the ship.

That eventually resulted in a loss of propulsion and steering, said Jennifer Homody, chairwoman of the board, who oversaw the investigation.

Investigators concluded that the reason the wire came loose is that a label was affixed to the wire too close to where it was plugged into the breaker.

The label prevented the wire from fully inserting into the breaker because the casing pushed against the label.

For NPR News, I'm Scott Mascione in Baltimore.