Why haven't scientists found evidence of humans interbreeding with aliens?
In my alternative universe, Atlantis was a real city that existed, although it wasn't called Atlantis or founded by humans. Atlantis or rather, Dosham was a city on an isolated landmass in the northeast Atlantic Ocean, which would later become the Rockall Plateau belonging to a dying race of aliens called the Duxiaris. The Duxiaris colonised Earth in 40,972 BCE and created a slave race called the Bassirid created from various species of hominin.
At some point, the Bassirid would overthrow their masters and commit genocide against them, becoming the dominant species on Earth. But the Bassirid's reign didn't last long because they fought a dramatic civil war that reduced their numbers and would almost go extinct in 14,000 BCE after trying to summon a planet-killing abomination, which led to Dosham sinking. Yet several thousand Bassirid fled the sunk city and found refugee in prehistoric Eurasia without their technology.
These surviving Bassirid would then adopt a nomadic hunter-gatherer lifestyle, wandering across the Eurasian landmass and diverge into two subcultures at an undetermined point. One made their way towards the Pontic-Caspian Steppes and the other migrated into the Levant. As these groups ventured further into the unknown, they interbred with humans to maintain genetic diversity at the cost of becoming more and more humanoid.
Soon both subcultures would become assimilated into the Yamna and Natufian cultures, ending the Bassirid's species. Yet, their legacies would live on through complex distorted oral traditions, which would influence Indo-European and Afroasiatic cultures. This phenomenon explains shared motifs like pantheons ruled by all-powerful sky gods that battle chaos serpents and cosmogenesis via sexual unity or corpse mutilation.
The only problem is that going extinct, both the Bassirid and Duxiaris did extensive interbreeding. After these species vanished, archaeologists, anthropologists or geneticists would have found that every one of Indo-European and Afroasiatic descent has Duxiaris DNA in them after their ancestors mingled with Bassirid.
Why hasn't such a shocking discovery occurred?
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