The SS United States is marking the end of the first leg of its journey to becoming the world's largest artificial reef.

The SS United States is towed to Alabama and draws onlookers to the East End of Dauphin Island on Monday, March 3, 2025. The historic ocean-liner is being towed to Mobile where it will be prepared for submersion as the world's largest artificial reef off the Florida Gulf Coast near Destin-Fort Walton. John Sharp

After being docked in Philadelphia for nearly three decades, the SS United States -- once the world's fastest ocean liner -- has arrived in Mobile, Al., ahead of schedule to be prepared to be turned into an artificial reef.