Actually, it's not as dumb as you think. Magnet fishers in Europe regularly pull unexploded grenades and other explosives out of the water. Unless it's obvious that the item holds no charge, they have to call the police, who cordon off the area until the item can be taken to a firing range and detonated safely.
Complete fail ! If you believe a 300 year old brass cannon submerged could somehow self ignite you are a fool Also repeat after me " Guss-sim-a-knee not" guess a mene "
