Taking on a Large Hollow Hill

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Have you hollowed it out all the way to bedrock? I ask this cause there were some pathways underneath where the main floor was an it could have had some spawners if I explored that far. Another possibility could be that there's another large hollow gill near where you are and they floated to the one you're at.
 
Set up a quarry and demolish the damn thing, it should take out spawners and pick up all the chests + items. Then just go around in a nice open area and kill anything left alive.

Unless this has been fixed, the chunk a quarry (the actual quarry machine itself) is in, when a server restarts, will be reverted if the quarry is in the Twilight Forest, so do NOT restart your server/shut down your game until it is finished and packed up or you will lose your quarry.
 
Have you hollowed it out all the way to bedrock? I ask this cause there were some pathways underneath where the main floor was an it could have had some spawners if I explored that far. Another possibility could be that there's another large hollow gill near where you are and they floated to the one you're at.
I have noticed them outside but, not other hills around ....... I don't think.