From the July 23, 2015, Marine Log "Navy salvages cannon from wreck of Confederate ironclad."
Well, at least the Confederate ironclad was not flying that flag (although entirely correct since the main flag under attack is the Confederate naval jack) so it so far has not offended certain groups.
The U.S. Navy is providing salvage assistance to bringing up what is left of the CSS Georgia, and that includes bringing up its four cannons.
In 1866, most of the ship's railroad armor was salvaged using underwater charges which shattered the Georgia's wooden hull.
To date, Navy divers have located and recovered 128 pieces of unexploded ordnance.
Bringing them Up. --Old B-Runner