I thought that was removed with B42

Did you ever sort out what both these items can replace tool wise? 

Alright, since this is a huge and difficult game, I figure most of the playerbase and interactions are still to be discussed and/or discovered. So, I have been wondering about generator fumes, specially now that we have multiple leveled buildings all over the place.   How, do fumes work? We all know they fill all indoor spaces in the same level as the generator, but how about levels above or below? Has anyone tried this? What happens if you place and connect a generator on a basement? or 2 levels above?   Mostly I ask out of curiostity and the need of clarification, but, also, I spent way to many resources clearing March Ridge and I'm too stubborn to just give up on the fallout shelter. 

Apparently the culprit was actually the rabbits who had multiplied beyond control. They were most likely thousands or hundreds of thousands spawning in at the same time. I managed to get here by teleporting just outside my house.

To add further information:   If I enter debug mode and choose to delete all animal population in the save, and then enter my zone, the game suffers from no lag or stuttering. So it most definitely have something to do with the animals in the base.