Dragon Quest

Dragon Quest:  In a later episode of this series the two main female characters 
go out searching for a cure for the heroes disease.  While the warrior woman 
is fighting a spider creature the princess falls into a quicksand sinkhole.  The 
warrior woman attempts to pull her out, only to get pulled in herself.  They both
sink into an underground cave.

Review:  While this scene may count more as a sinkhole scene
I think it had enough qualities of quicksand to count it as such.
Also after watching this series I had very high hopes that these two
would end up sinking.