Vennemann posits that starting in the fifth millennium BCE, Atlantic/Semitidic seafaring colonizers (related to Semitic speakers) settled the coastal regions of Western and Northern Europe.
The comparative method , the gold standard for determining language relationships, does not strongly support these deep-time connections. Europa Vasconica-Europa Semitica
This "substrate" influenced the vocabulary and structure of the languages that eventually replaced them. Vennemann posits that starting in the fifth millennium