Well - I doubt there's yet another spirit being kept under here, but then again, we hardly expected to find one there in the first place. But some abomination being held down there in place by shifts? It wouldn't be the first time we've heard of something like that being tampered with. The presence of an actual skeleton is enough for any amount of caution to be taken.

We also don't fully know the motivations of those who originally held the key to the area to begin with.