Floods on a catastrophic scale have been recorded in the mythologies and histories of all ancient civilisations. There are various possible causes for such devastating floods. Undoubtedly, many of these legends originated with the raising of sea levels that followed the de-glaciation at the end of the last Ice Age.
Other floods may have been caused by tsunami resulting from underwater earthquakes or storegga. Quite recently it was discovered(a) that around 6000 BC a calamitous tsunami was generated in the Mediterranean when Mt. Etna in Sicily sent approximately 6 cubic miles of rock and rubble crashing into the sea. One could be forgiven for speculating that this event may have triggered the flooding of the Black Sea, which is dated to this same period.
Since writing, as we know it, did not develop until long after de-glaciation, it is virtually impossible to precisely identify the date, location or extent of any of the early myths relating to these possible de-glaciation inundations.
Flood Myths are found throughout the world and for centuries were seen as confirmation of the reality and universality of the Biblical Flood of Noah. However, when it was discovered that the Earth had endured a series of Ice Ages and that following each of these, the melting ice caps led to worldwide inundations with a consequent immortalisation of these events through locally developed myths, it led to speculation that Noah’s Flood may have been just a regional but nonetheless a catastrophic event.
Recent years have seen the above-mentioned flooding of the Black Sea or even more controversially, the flooding of the Mediterranean basins, following the breaching of a suggested landbridge at Gibraltar, proposed as possible sources of the story of Noah in the Bible. These inundations are dated at around 5600 BC and their memory should have survived in the traditions and mythologies of the region. In addition to that, the Persian Gulf is also accepted by many to have been dry during the last Ice Age but also began to flood around 5000 BC. In Northern Europe, the Baltic Sea and the Celtic Shelf both suffered post-glacial inundations, while around the same time in the South China Sea the enormous Sunda Shelf suffered extensive flooding.
Plato’s Atlantis story contains a curious reference in Timaeus (23a-c) to a series of floods having apparently occurred in the Eastern Mediterranean. If based on historical fact, on its own, the Biblical Flood or the breach of a land bridge cannot explain this succession of inundations, but suggests that there could be a much more complex story, still to be revealed that was spread over millennia.
An extensive collection of Flood myths can be found on the Internet(b).
(a) http://www.sciencedaily.com/releases/2006/11/061128083754.htm
(b) http://www.talkorigins.org/faqs/flood-myths.html

