We know that relatively minor sea-level rises could set off major ice-sheet breakups, and it has been suggested by Stephen Oppenheimer that the treme… - Graham Hancock

Since my first research visit to Malta in November 1999 I've learned that objects — and even places — of archaeological importance can and do disappear here in mysterious ways. For example, ancient remains of an estimated 7000 people were found in the Hypogeum of Hal Saflieni, buried in a matrix of red earth, when it was excavated by Sir Themistocles Zammit at the beginning of the twentieth century. Today only six skulls are left, stashed out of public view in two plastic crates in the cavernous vaults of Malta's National Museum of Archaeology. Nobody has the faintest idea what has happened to all the rest of the bones. They've just 'vanished', according to officials at the Museum.
And the six skulls? After much pressure and protest I have been allowed to see them only this morning and they are — I must confess — extremely and unsettlingly odd. They are weirdly elongated — dolichocephalic is the technical term but this is dolichocephalism of the most extreme form. And one of the skulls, though that of an adult, is entirely lacking in the fossa median — the clearly-visible 'join' that runs along the top of the head where two plates of bone are separated in infancy (thus facilitating the process of birth) but later join together in adulthood. I should be paying attention to the fantastic views and seascapes unfolding beneath the helicopter but I keep on wondering: what would people with skulls like that have looked like during life? How could they have survived birth and grown to adulthood? And did the other skulls from the Hypogeum — the lost skulls, the lost bones — also show the same distinctive peculiarity?

[The Edfu Building Texts in Egypt] take us back to a very remote period called the 'Early Primeval Age of the Gods' — and these gods, it transpires, were not originally Egyptian, but lived on a sacred island, the 'Homeland of the Primeval Ones,' and in the midst of a great ocean. Then, at some unspecified time in the past, an immense cataclysm shook the earth and a flood poured over this island, where 'the earliest mansions of the gods' had been founded, destroying it utterly, submerging all its holy places, and killing most of its divine inhabitants. Some survived, however, and we are told that this remnant set sail in their ships (for the texts leave us in no doubt that these 'gods' of the early primeval age were navigators) to 'wander' the world. Their purpose in doing so was nothing less than to re-create and revive the essence of their lost homeland, to bring about, in short: 'The resurrection of the former world of the gods ... The re-creation of a destroyed world.'
[...]
The takeaway is that the texts invite us to consider the possibility that the survivors of a lost civilization, thought of as 'gods' but manifestly human, set about 'wandering' the world in the aftermath of an extinction-level global cataclysm. By happenstance it was primarily hunter-gatherer populations, the peoples of the mountains, jungles, and deserts — 'the unlettered and the uncultured,' as Plato so eloquently put it in his account of the end of Atlantis — who had been 'spared the scourge of the deluge.' Settling among them, the wanderers entertained the desperate hope that their high civilization could be restarted, or that at least something of its knowledge, wisdom, and spiritual ideas could be passed on so that mankind in the post-cataclysmic world would not be compelled to 'begin again like children, in complete ignorance of what happened in early times.

It was Cesare Emiliani who first drew serious attention to the possibility of post-glacial superfloods. In a paper published in Science magazine in 1975, he and a group of colleagues presented startling evidence from deep-sea cores from the north-eastern part of the Gulf of Mexico. The evidence revealed 'a 2.4 per cent isotopic anomaly between 12,000 and 11,000 years ago', which the authors correctly interpreted as having been caused by 'the occurrence of major flooding of ice meltwater into the Gulf of Mexico ... centring at about 11,600 years before the present'.