I found a great article on the threat to our gulf coast treasures under water, all of the sunken ships some dating back to the war of 1812, other from WWII. http://news.yahoo.com/s/ap/us_gulf_oil_spill_shipwrecks
I also found a site that has more info on each sunken vessel. It is http://www.gomr.mms.gov/homepg/regulate/environ/archaeological/shipwrecks.html
I found it all fascinating but then archeology has always been my shtick. Enjoy.