The Coast Guard is searching for a man thrown into the Mobile River Wednesday.
High winds caused the Carnival Triumph to break free from its dock.
It slammed into a security guard hut and sent two people into the water.
One man was rescued.
Tug boats kept the ship from floating farther down river and pulled it back to port.
Carnival says their initial inspection found limited damage.
The Triumph has been docked in Mobile since a February engine fire crippled the ship in the Gulf of Mexico with more than 4,200 passengers on board.