Secret of Eridu is a Wolfenstein 3D mod, courtesy of Team Raycast. Initially announced in July 2007, mainly instigated by doomjedi, the mod's plot builds on a series of books by Zecharia Sitchin which deals with the ancient astronauts theory and Sumerian mythology in general.
The name Eridu was an actual ancient Sumerian city.
Though the mod has most of the graphics done and a functioning EXE, numerous things have still not been finished, and while it is not officially canceled it has been put on hold for an amount of time. Screenshots survive and depict an atmosphere rarely explored in any Wolfenstein 3D modification.