I removed the comment about the civilization being "primitive". that needs to be defined more, since there is speculation to the contrary, and even some evidence
means "before the [[Flood]] :" civilizations during that time were primitive, but prosperous. The legendary kingdom of [[Atlantis]] may have existed during this period.
According to the Bible, fallen [[Angels]], ("the Sons of God" Gen. 6:2), had relations with human women, giving birth to giants: "the same became mighty men which were of old, men of renown."(Gen. 6:4)
Besides their powerful, super-human rulers, Antediluvian civilizations were wicked and violent
. (Gen. 6:5) This leads us to believe that they were not struggling to survive, rather they were basking in excess; they could afford to become corrupt because of the surplus of resources.