Divers swim over the former missile-tracking ship Gen. Hoyt S. Vandenberg amid thousands of fish Friday, May 21, 2010, off Key West, Fla., in the Florida Keys National Marine Sanctuary. A year after the ship was intentionally sunk May 27, 2009, the artificial reef has attracted more than 20,000 divers and 113 different species of fish.

Divers swim over the former missile-tracking ship Gen. Hoyt S. Vandenberg amid thousands of fish Friday, May 21, 2010, off Key West, Fla., in the Florida Keys National Marine Sanctuary. A year after the ship was intentionally sunk May 27, 2009, the artificial reef has attracted more than 20,000 divers and 113 different species of fish. (Don Kincaid/Florida Keys News Bureau/HO)