Kabbalah do Rodzaju 7:11

In the 600th year of the sixth millennium the gates of wisdom above together will the wellsprings of wisdom below will open up and the world will prepare to usher in the seventh millennium. This is symbolized by one who begins preparations for ushering in the Sabbath on the afternoon of the sixth day. In the same way, toward the end of the sixth millennium, preparations are made for entering the seventh. The hint for this is “In the 600th year of Noah’s life ... all the wellsprings of the great deep burst forth and the flood gates of the heavens were opened.