theprestige
Penultimate Amazing
The shell traveled 5 km after being pointed at the ground? It's not that surprising. This is what happens when you make cannon rounds out of flubber.
Wow, they missed the Earth...while standing on it!
From the description, it seems like they fired from a rise, with the barrel angled downwards, over a valley floor that was within the boundaries of the range. Such a setup could allow the shell to travel quite far, before coming to rest safely inside the range. Depending on the height of the rise, the degree of the downward angle of the barrel, and the extent of the range in the valley below.
If a straight line extending from the barrel of the gun intersects the ground before crossing the range boundary, I think it's perfectly reasonable to expect that a ballistic projectile fired from that gun will hit the ground somewhere short of the far edge of the range.
Assuming a responsible setup (and I've no reason to assume otherwise at this point), the shell's actual trajectory appears to be anomalous.