The Spiegel Grove rolls over after it sunk prematurely in the Florida Keys National Marine Sanctuary May 17, 2002, in this handout photo released to Reuters May 16, 2012. The vessel was being prepared to be intentionally sunk as an artificial reef, but began taking on water faster than expected. All personnel evacuated the ship without incident and about three weeks later, a salvage crew fully sunk the former US Navy landing ship dock on its starboard side. [Photo/Agencies]

The upside-down hull of the Spiegel Grove lies off Key Largo, Fl. May 30, 2002 in this handout photo obtained by Reuters May 16, 2012, as salvage divers make preparations to rotate and fully sink the 510-foot retired Navy vessel as an artificial reef in the Florida Keys National Marine Sanctuary. [Photo/Agencies]