Carbon dating wrong
As scientists will often claim something to be millions or billions of years old (ages that do not conform to the Biblical account of the age of the earth), Christians are often left wondering about the accuracy of the carbon-14 method.
A small percentage of carbon atoms have an atomic weight of 14 AMUs. Carbon-14 is an unstable, radioactive isotope of carbon 12.
The water in these subterranean chambers would not have contained carbon-14, as the water was shielded from cosmic radiation.
This would have upset the ratio of carbon-14 to carbon-12. Libby also assumed that the amount of carbon-14 being presently produced had equaled the amount of carbon-12 he assumed that they had reached a balance.
If you start with no carbon-14 in the atmosphere, it would take over 50,000 years for the amount being produced to reach equilibrium with the amount decaying.
One of the reasons we know that the earth is less than 50,000 years old is because of the biblical record.