atlantis was off the coast of the pillars of hercules, it sank due to the lower dryas sea level rise event, its mentioned in some of platos fragmentary texts, although academia does not take it seriously when you take in to account that we know that the lower dryas sea level rise event happened even though we dont know the exact time scale or cause then it adds a lot of credence to the off handed line of dialog that mentioned "the waters where shallow and muddy at the time"

if they had accurate knowledge about the sea level of the time then it makes a lot of scene that they would have known the location accurately too

they also mention egyptian and greek societies being like brothers which is quite interesting and also holds up to genetic records of early egyptian pharaohs, they seemed to have genuine knowledge of what is now lost history (to us at least, im sure its still out there)