There is a Fan Made Mythic Mediterranean, but it is in Spanish...
https://www.drivethrurpg.com/m/product/166601
Maybe you can use it meanwhile...
Also, Mythic Babylon can be used... I have not read it yet. Along with Age of Bronze Graphic Novel by Eric Shanower you have plenty of art and inspiration for an Atlantis Campaign.
https://www.drivethrurpg.com/m/product/355333
http://age-of-bronze.com/