Inspiration: Brinicle as death from a higher plane

From KQED, this got my GM setting thoughts flowing: This extraordinary time-lapse video filmed by the BBC for their "Frozen Planet" series shows how cold, sinking brine forms a deadly "brinicle" when it comes into contact with warmer waters below the surface.   Given the concept of "higher" or "purer" planes of existence mixing in strange ways, this is a nice example of how it works in