53:54

فَغَشَّاهَا مَا غَشَّىٰ

Transliteration:

Faghashshaha ma ghashsha

Word by Word:

So covered them what covered.

Translations:

and then covered them from sight forever.

So that (ruins unknown) have covered them up.

So that there covered them that which did cover.

And that He destroyed the First 'Ad:

And covered them by that which He covered.