I have spent a lot of time with UXO's, everything from an SA-7 that I uncovered with a motor grader, to untold amount of mortars that we ran over with vibratory rollers. Mortars were so common it got to the point we would move them out of our way so we didn't have to stop the job for the 4 hours it took for EOD get there, and pick the thing up and throw it in the back of the truck. A lot of old Russian Anti personel mines again very common. One of the biggest was an old rather large welcome package left behind from the good old USA left for us lowly subcontractors to find 2 years after the invasion of Iraq. All that said UXO's don't bother me a bit, but something that big, that old, and that unstable, I can promise that I do believe that I would be somewhere on vacation, in some non extradition country in South America, but that is where I usually go on vacation.