Students at the University of West Florida are combing through a 450-year-old shipwreck that was commanded by Pensacola's founder.

Researchers say the wreck was part of Don Tristan de Luna's fleet. They have recovered everything from a stone cannon ball to ceramic dishes to a chicken bone.

The underwater excavation in Pensacola Bay is being conducted this summer by about 20 maritime archaeology students.

The vessel was located in 2006 and identified in 2007 as part of Luna's colonization fleet that made landfall in 1559. The first ship was discovered in 1992 just a quarter-mile from the original site.