ToME: the Tales of Maj'Eyal

Have a Lich Necromancer who got trapped in the collapsing tunnels and while I realize that it doesn't have to breathe, I thought that you were crushed regardless. Well, that didn't happen. I just hung out there until a burrower freed me.

Is this a bug or..?

when sand fall on you you take 25% (iirc) of your max hp as damage. Then nothing else happens if you don't need to breathe.
you can dig yourself out without needing to wait for burrowers

Thanks!