 Delgado worked with archaeologist Dr. Allen Pastron[1] on several excavations beginning in 1979.Among the buried ships from 1849 to 1851 that he would help excavate or analyze are the storeships Niantic and General Harrison, the ships William Gray and Candace, and many more.He also learned to scuba dive during his NPS tenure, and worked closely with the Park Service's Submerged Cultural Resources Unit after the NPS sent him to the Presidio of San Francisco to attend an Army dive class.