Young-earth chronology dates the Flood to 2348 BC. The Step Pyramid at Saqqara dates to about 2450 BC — a century earlier — and its lower chambers show no water damage. On the standard reading, a global flood swept the earth a century after the pyramid was built, and left the pyramid dry.
The Septuagint, the Samaritan Pentateuch, Josephus, and three early church chroniclers — Theophilus of Antioch, Julius Africanus, and Eusebius — all carry roughly 650 extra years across the post-Flood patriarchs of Genesis 11. Restore them and the Flood moves back to around 3000 BC, comfortably before the pyramids, and the puzzle quietly resolves.
Genesis 11:10–26 · Eusebius, Chronicon
Sources: the Septuagint, the Samaritan Pentateuch, Josephus, and the early chroniclers Theophilus of Antioch, Julius Africanus, and Eusebius (Chronicon); genealogy from Genesis 11:10–26.
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