Is there rock beneath quicksand?

Is there rock underneath quicksand? Or does the sand go on forever? It says in the Bible, that "underneath are the everlasting arms" (Deut 33.27).... Does that include underneath quicksand? I guess it must do. I guess there is no-where too low, no-where too deep, that the everlasting arms aren't still underneath.....

I'm so glad that it uses the word 'underneath'..... when i was in hospital, i heard these words in my heart one night... like someone was whispering them to me... i didn't know they came from the Bible, i thought i was making it up..... i reasoned that surely God wouldn't be 'underneath' things, surely He should be above?... yet somehow i knew it was true..... that underneath the bed i was lying in were the everlasting arms... underneath me when i fell and had a seizure were the everlasting arms... underneath me when i sinned were the everlasting arms... that underneath everything, however far i fell, were the everlasting arms..... and that must still be true today... underneath are the everlasting arms.

"There is none like God... who rides through the heavens to your help... The eternal God is your dwelling place, and underneath are the everlasting arms. And he thrust out the enemy before you and said 'Destroy'. " - Deut 33