Annette Robertson explores a portion of the artificial reef Spiegel Grove in the Florida Keys National Marine Sanctuary, off Key Largo, Fl. May 16, 2012. May 17, 2012 marks the 10th anniversary of the former 510-foot, US Navy landing ship dock's scuttling to become an artificial reef. The Spiegel Grove gained international attention May 17, 2002, when it sank prematurely and rolled over leaving its upside-down bow protruding above the sea, before salvagers sank it fully on its side three weeks later and Hurricane Dennis helped to set it upright in July 2005. [Photo/Agencies]

Annette Robertson explores a portion of the artificial reef Spiegel Grove in the Florida Keys National Marine Sanctuary, off Key Largo, Fl. May 16, 2012. [Photo/Agencies]