It's been a week since the SS United States left its Philadelphia pier for the last time after it was sold to a Florida county to become part of an artificial reef.

The ship will join Florida’s 4,300 artificial reefs—human-made places for fish and other marine life to live. How do these reefs work?

The exact location of where the SS United States will be sunk along the Gulf Coast fhas not been set, but it is expected to be about 20 nautical miles south of the Destin-Fort Walton Beach area.

The SS United States, built more than 70 years ago, is being towed from Philadelphia to Mobile, Alabama, to become the world's largest artificial reef.

The SS United States is now off the coast of Florida.After a series of delays, the 990-foot ocean liner left Philadelphia last week, on its way to become the wo