Im at the end of my game with Fallout Shelter. 200 dwellers, reorganized vault for no Molerats, many 20+ weapons,etc. So what is a bored Overlord to do? Experiment of course. I found an unusual scenario I believe that I thought I would ask others to disprove/reaffirm.

I decided the best thing to try was to leave the game running without intervention by me for a day or more. The Mr Handy's currently do all the resource collecting automatically in my vault so no problem there. I expected random attacks from raiders to kill off my guards in the guard room and then additional attacks over time that would destroy the vault from the top down requiring a lot of resurrecting when I got back to it after a day or so.

This was not the case. It appears that once you lose people in the vault room and leave them dead, no more attacks on that door happen until you remove them or resurrect them. Can anybody else confirm?

Many times, the focus is on another room that got a random fire/radroach problem but the dwellers always put it out and regain their HP before I they get a chance to die as an aside.

The game stops spawning unknowns when you're not logged in; all that runs are automatic timers for the wasteland, resources and training. You will not get incidents and resource drops stop after a bit of time (minutes?) so it's unlikely to go to zero.