https://youtu.be/qZbUXewlQDk?si=mJsUWEq54zgQkvQ5
Sal reviews Baltimore Harbor video of the MV Dali close encounter of the 3rd kind with the Key Bridge pier. Sal confirms loss of topside lighting implies larger loss of power that interrupted steering (by wire) on Dali.

Power interruption caused Dali to track to the right of her planned movement pushing the bridge deck off the bridge pier to starboard. This initiated a cascade failure of the bridge deck.

Dali had a Bay pilot coaching the CO (law).