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.

The ship is being towed to Mobile, Alabama, to be prepared for sinking as 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.

The SS United States completed its long trip from Philadelphia to the Port City on Monday, but in many ways, its journey is just beginning.