Archaeology Magazine's November/December 2011 issue (Vol. 64 #6) featured an article Letters from Bermuda: Secrets of a Civil War Shipwreck by Dr. James Delgado. The article describes the sinking of the American Civil War blockade runner Mary Celestia on a Bermuda reef and the 2011 excavation of the wreck by scientists from the American National Oceanographic and Atmospheric Administration (NOAA) and the Bermuda Government.
The article can be read here: http://www.archaeology.org/1111/letter/mary_celestia_bermuda_civil_war_noaa.html