With out doubt there was a wonderful civilisation beneath the current Sahara at one time .
But do not get hung up on this being Atlantis .
Consider
There are several recently discovered advanced civilisations in various parts of the globe and all from around the same time .
Folk lore has it that sky men came down in several locations . Same story across the globe
It seems most likely that the universal Flood story accounts for their disappearance with Plato at that time only aware of doorstep evidence .
ERGO --------
The most intriguing narrative , imho , is the one involving Antarctica and the further possibility that this continent was first located in middle/south atlantic but was pushed south .
Most likely history at this point ?
A globe covering era of high civilisation and technology. that disappeared in the Great Flood but with stragglers and their issue identifiable via DNA .
Great narrative . Better than soppy Netflix and boring TV . imho