I would stay there

As long as they are stable it's totally fine. This is so stereotypical Canadian, but we were taught to build these at camp and we were also taught what to do in case they collapsed on us while we were inside.

What does one do in a collapsed igloo?

Basically don't freak out and stay put. You're supposed to breath slow to conserve oxygen and cover your arms over your head so when people come to dig you out, they'd hit your arm with a shovel not your head. Also, don't build it alone because if it does collapse you're screwed. It's been almost ten years and I can remember that but not what I was supposed to do for my University assignments.

I'm sorry it must be in the form of a rhyme.

"Do you what to die in the snow? Here's some tips that you should know: cover your arms over your head, so a shovel won't strike it and make you dead. Take slow breathes to conserve your air, you only have so much while buried there. Don't build it alone if you want to go home. Just stay tight and you'll be alright, tonight." @leincredibleme

*stands up and claps @sm19*