Trapped underground in one of those things is close to the very last place I would want to be under any circumstances.
Take a look at a couple of the luxury conversions at the link I provided. It wouldn’t be all bad with the jacuzzi, etc.
As long as you are well supplied, you could shelter in place for an extended period of time.
FYI - sheltering in place is an important part of any readiness plan. This is how you would do it in relative safety and luxury.
Are these the people the Bible mentions saying “rocks fall on us”?