So it looked like he was turning into the channel. Power went out, probably overcorrected trying to steer while the power is off. Power comes back on and now all the sudden he is headed straight for the pier. Power flickers again, he tries to back up (which even anyone who has driven a bass boat knows is counterproductive but instinctive) and slams into the pier.

I don’t know schit about big ships or bridges but that looks like what happened just watching the various videos out there.