>>32483163From what I understand, volcanic ash can deposit into the ground/soil itself. Meaning unless you somehow manage to remove all that ash or filter it, any life might start having problems to breathe no matter how deep you are underground. Here's a picture of roughly the amount of ash that Risuners would have to deal with.
>>32483239The ash would do that by itself, the winter is just an added insult to injury.
>>32483628Yeah, that I think. Dunno the timeframe either, and I'm not finding any exact figures. Apparently it might need a year? Maybe? Not sure.