My two cents:
A careful examination of the coral reefs shows that this event did not occur.
A coral reefs age is easily figured out by its calcium deposits left behind by coral polyps during annual lunar cycles. In simple terms you count the deposits and you figure out the age.
Corals are one of the oceans most sensitive life forms and easily die (bleach) with high concentrations of waste products (sediment run off that cause high levels of ammonia, nitrates, phosphates, total dissolved solids, oxygen depletion, etc.) that then leads to algae blooms that block sunlight from the corals and then add more waste once the algae dies. This assures the corals death.
If a global deluge happened (that covered the whole earth) and added an extraordinary amount of fresh water to the earth oceans, pH, alkalinity and salinity levels would drop incredibly, once again assuring that coral reefs would die.
Examining the coral reefs show that 4000 plus years ago a uniform global crisis did not happen.