Historic Liner The SS United States Embarks On Its Final Voyage. The historic ocean liner the SS United States embarked on its final journey from Philadelphia to the Gulf of Mexico to be transformed into the world's largest artificial reef.

It’s official, Philadelphia. After years of detailed plans and delays, the long-decaying ship, SS United States, has finally left Pier 82 on the Delaware River. Now, after three decades, it’s on its way to becoming an artificial reef off the coast of Florida.