As much as I would like to see that it was defused and saved as the relic it was, it's very very dangerous to do even for the experts which are few and far between, modern Bomb Squads aren't up to the task, or I should say the risk involved in defusing them,that's why they explode these relics instead, IMHO 1000 old cannonballs aren't worth the life of even one person.
The experts that know how to defused or risk defusing these relics aren't modern Bomb Squad personnel but are themselves historians and relic enthusiasts first and foremost, one such expert, Sam White was considered one of if not the best at defusing these old cannonballs, sadly he died in 2008 defusing a Civil War cannonball, this just goes to show how dangerous it is defusing one even for an expert.
http://www.americandigger.com/SamWhiteAccident.htm
http://www.foxnews.com/story/2008/05/02/virginia-man-killed-in-civil-war-cannonball-blast.html
One other expert at defusing these cannonballs that Steve may very well know is Steve Phillips of Southern Skin Divers Supply in Alabama who has gone to Nome for many, many years to dredge for gold both in the ocean and inland, Steve has the best way IMHO to defuse these cannonballs without risking someone getting killed, the risk involved is when one is drilling a hole in the cannonball to remove the black powder, one little spark and BOOM , Steve has build a shed and rigged up a remote controlled drilling press to do the drilling while Steve is safely out of harms way, once the hole is drilled there's no more danger involved, one has to just empty the black powder from the cannonball.
A link to Steve's website..(there's no mention of his cannonball defusing on the website, just diving, dredging, etc.)
http://www.ssdsupply.com/