The SS United States, once the fastest ocean liner, is making its final journey to become the world's largest artificial reef off Florida's Gulf Coast. Tugboats are guiding the vessel to Mobile, Alabama,

The SS United States is on her way to a new life — quite literally. The 990-foot ocean liner is headed south to the Gulf Coast, where she will be sunk off the coast of Okaloosa County, Florida, to become the world's largest artificial reef.

The SS United States has officially began its journey out of Philadelphia after nearly 30 years and several months of delays, writes Danielle Ellis for