By dud you mean that the explosives are harmless. NO it had a fuze mechanism that did not properly function the first time so it has been sitting in the ground all these years alert & ready to go BOOM if someone decides to disturb it .
Heck the French still are losing around 8-12 people a year to accidents with unexploded ordnance from world war one,especially dangerous are the chemical shells because they often still have real chemical weapons inside like liquid mustard gas.
Whoa—seriously? Eight to 12 people a year from WWI bombs? That’s incredible. Counting my blessings; no matter how much I poke around in the flower and tomato beds, I’ll never disturb a mustard gas bomb.