And the waters prevailed exceedingly upon the earth;
and all the high hills, that were under the whole heaven, were covered.
Genesis 7:19
"The global Flood is the most significant event that affected the amount of carbon-14 in the atmosphere in the past, but scientists ignore this, assuming it never happened. The Flood disrupted the
carbon reservoirs on Earth.
During the Flood, volcanic eruptions blasted carbon dioxide (low in carbon-14) into the atmosphere, vast quantities of vegetation (containing carbon) were buried under sediment, carbon dioxide was dissolved in the oceans, carbon was incorporated into the vast formations of carbonate rocks and changes in the earth’s magnetic fields affected the cosmic shield, changing the rate of production of carbon-14.
Creation scientists estimate that proportion of carbon-14 in the atmosphere relative to carbon-12 was much lower after the Flood, which would give dates that are very old. They suggest it rapidly increased in the early post-Flood period. It has still not wholly recovered from this deviation from equilibrium.
Carbon-14 can also be affected locally by volcanic eruptions causing dates to be too old." CMI