A 990-foot shell of an ocean liner incapable of self-propulsion was essentially dragged by a vessel a fraction of its size from Philadelphia to Mobile, Ala., in less than two weeks. Photos of the SS United States being pulled by a 140-foot tugboat prompted many to ask how the move was even possible.

The SS United States has completed its voyage from Philadelphia to Mobile, Alabama, where it will be prepped to become part of the world's largest artificial reef.

Crews will spend about six months cleaning the 1,000-foot vessel and removing hazardous materials as they prepare it to eventually be sunk off Florida's Gulf coast.

Looking rusty and every bit of 75 years old, the former luxury cruiser limped into the Port of Mobile Monday with the help of a couple of tug boats.