The documentary did mention that they thought they'd found a few minor trading posts due to the research. But if they are so easily viewed, I
find it hard to believe that an entire civilization (especially one reported to be as grandiose as Atlantis) could be hidden beneath
Ahh, but the ancient civilization of South America (i.e. continent of Atlantis), is easily seen, no?

And trade routes between South America and
Ancient Egypt are all but confirmed for many archeologists.
Supernova, I think you are thinking of the island of Thera (an excellent contender, but still lacking many pieces of the puzzle).
The bottom line is, Plato stated the story was fact. He was very precise with his measurements, including the size of the continent (i.e. larger than
Libya and Asia combined, etc.) The confusion arises because the continent and the capital city shared the same name. The city sank, the continent
did not.
The Altiplano fits the bill to a tee...including even a local story about a sinking capital city, the orichalcum, the red/white/black brick
combination, and every single measurement given.