The Deluge or Noah’s Flood are the commonly used terms when referring to the biblical flood of Genesis. It might perhaps be more accurate to use the plural, as there is evidence of several large-scale catastrophic inundations within the human memory. The Noachian deluge has been the subject of continuous debate: was it real or pure fantasy, was it local, regional or global and is the Ark to be found on Mt. Ararat.
The Flood of Noah is an echo of the Babylonian Gilgamesh epic, which in turn has a resonance with the deluge story of Manu in Indian mythology. If all three relate to the same event it would be of great interest to discover if there was a shared origin.
Noah is the hero of the Deluge story in Genesis. He was also an accomplished shipbuilder and viticulturist. According to some he was also an Atlantean! Cosmas Indicopleustes a 6th century AD theologian and geographer from Alexandria wrote of Atlantis as a large island in the western ocean. He also added a twist to the tale by recording an ancient tradition that Noah had resided on Atlantis! More recently, Frank Joseph [108.85] has endorsed this daft idea.
Interestingly, so many of the deluge stories include a scenario where the ’hero’ is warned of the impending doom. To me, this would make sense that where a landbridge was threatened by gradually rising waters on one side, simple observation would have provided adequate time to warn those at risk on the other side.
Another identification, by Robert Bowie Johnson Jr., is that Noah is Nereus in Greek mythology and widely depicted in Greek art(c). Confusingly, it has also been suggested(a) that Enoch, usually accepted as the grandfather of Noah, were the same person.
According to Plato, Atlantis was destroyed by the gods as a punishment for their wickedness, while the same reason is given in the Bible for the obliteration of Noah’s people. Coincidentally, both Atlantis and Noah’s homeland, which was probably located in Mesopotamia, were destroyed by water leading to the not unreasonable suggestion that the two stories are related.
While the biblical account of the Deluge does not stand up to detailed scrutiny(j), the global ubiquity of Flood stories is seldom adequately explained. Some possibilities that occur to me are related to the ending of the last Ice Age, which had watery consequences around the world. While the rising sea level took place in fits and starts, there were more dramatic events during this period such as the huge meltwater lake discharges and Heinrich Events that occurred across North America and Eurasia. The effect in the southern hemisphere was less spectacular. Survivors would have been forced to migrate in all directions, bringing their account of these floods with them. Another explanation, but in my view, a more likely cause of global floods would have been a close encounter with a large extraterrestrial body, an idea promoted by various researchers such as Emilio Spedicato.
Apart from the story of the actual flood, global or otherwise, the detailed biblical account of the building of the Ark along with the gathering of the animals and the voyage itself does not hold water (sorry)(y). Some decades ago, Roger A. Moore offered a forensic study of the account, which, is still impressive(x).
In March 2019, a paper by Roger M. Pearlman put forward another radical idea, namely, that Göbekli Tepe had been founded by Noah (Noach) and his sons(u).
A more light-hearted look at the story of Noah is also worth a read(n).
Every aspect of Noah’s Deluge story in the Bible has been a source of controversy for centuries. From the nature and cause of the Flood itself, as well as the building of the Ark and its final resting place and of course the date of the event.
Some years ago, Pastor Bertrand L. Comparet (1901-1983), a staunch racist(w), denied that the Flood of Noah had been a global event(v).
2018 began with matters hitting rock-bottom when an English language newspaper offered the following headline(l) “Turkish academic claims Prophet Noah used a cell phone to call his son before the flood.” Unsurprisingly, Jason Colavito has covered this story with an interesting blog(m).
Plato’s Atlantis story contains a curious reference in Timaeus (23a-c) to a series of floods that occurred in the Eastern Mediterranean(ah) since the Atlantean war, namely, those of Ogyges, Deucalion and Dardanus. If based on historical fact, on its own, the Biblical Flood or the breach of a landbridge cannot explain this succession of inundations but suggests that there could be a much more complex story, still to be revealed, which was spread over millennia.
Anastasios Stamou presented a paper [750.183] to the 2008 Atlantis Conference in which he reviewed the evidence relating to three floods that befell ancient Greece and alluded to by Plato. Drawing on ancient Greek texts including the Parian Marble, he places these events in chronological order beginning with the flood of Ogyges, then Deucalion’s and finally that of Dardanos.
Stamou accepts that conventional wisdom has it that these flood events occurred in the 2nd millennium BC and based his paper on that assumption. However, he expressed serious doubts about this dating suggesting a much earlier date for some inundations and promising a future paper dealing with this revision.
Stephen Oppenheimer mentions  three sudden ice-melts, 14,000, 11,500 and 8,000 years ago that would have had a global effect. It should be considered that the second date is close to Plato’s apparent date for the destruction of Atlantis.
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.
Similarly, Gérard Gertoux places the Deluge circa 3200 BC in a lengthy paper(z), in which he also controversially touches on subjects such as radiocarbon dating, the age of the patriarchs, the Ice Ages, evolution and more.
China has its own ‘Great Flood’ tradition, which in the August 2016 edition of Science journal had its reality given strong support in a paper(bi) by a mainly Chinese team of researchers, who date the event to 1920 BC.
Recent years have seen the above-mentioned flooding of the Black Sea or even more controversially, the flooding of the desiccated 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 to 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.
On a more controversial level, Donald Patten and Samuel Windsor presented evidence  for a series of close encounters between Mars and the Earth during the 1st millennium BC. David Rohl, the Egyptologist, dates Noah’s Flood at 3114 BC  and links it with the climatic consequences of a major catastrophe in the Aleutian Islands.
Alexander and Edith Tollman linked the Noachian Deluge with the consequences of a cometary impact in 7552 BC. On the other hand, G.F. Dodwell the Australian astronomer, after studying ancient gnomons, concluded that it was a worldwide catastrophe in 2345 BC that altered the Earth’s tilt, leading to the Deluge. This is comparable with the 1696 claim by William Whiston that the earth had an encounter with a comet in 2346 BC, which caused the Flood of Noah. Emilio Spedicato advocates 3161 BC as the date of the biblical Deluge(ac), which has also been endorsed by Stuart L. Harris(ad).
When Ryan & Pitman(ae) published their 1997 theory that around 5600 BC, the Black Sea had been flooded by water from the Aegean breaching the Bosporus, it did not take long before it was speculated that the event was reflected in the story of Noah’s Deluge. With little delay, strong objections to the idea were raised by many others(af).
T.R.Holme has an interesting article(ax) on the flooding of the Black Sea and the migration from the region that resulted. He also links that event with the work of the late Marija Gimbutas (1921-1994).
Nick Thom, an engineering lecturer at Nottingham University has written The Great Flood  which gives an overview of many Flood myths, but more importantly, he identifies the emptying of glacial Lake Agassiz around 6250 BC as the mechanism which caused a tilting of the Earth, which in turn generated a global deluge remembered by the survivors in myth and later recorded in scriptures. This is also fully outlined in a lengthy entitled, A Re-interpretation of the 8.2ky BP Event(ag). Also relevant to our subject is his claim that the flow of water was from the Black Sea into the Aegean rather than the other way around!
Jeffrey Goodman, the controversial author of Psychic Archeology , maintains that “Noah’s Flood was, in reality, a tsunami caused by a comet” and supports this contention with a retranslation of Genesis 7:11 (ar).
Kirk Kirchev in a recent (April 2018) two-part article(bb) “offers a unifying scientific hypothesis that connects diverse ancient flood myths with mainstream scientific fact.” and concluded that “If my calculations and assumptions are correct, an object of around 900 km in diameter passing the earth at an altitude of less than 1000 kilometres (621.37 miles) (of average, rocky density) would be large and heavy enough to create a strong localized tidal uplift in the oceans beneath its flight path (approximately 50 times the current tidal amplitude). That is large enough to destroy most of humankind, and a large portion of the fauna, but small enough to not cause a major extinction event or to disturb earth’s orbital path and rotation.”
>Immanuel Velikovsky’s controversial cosmological ideas suggest that our Earth had at one point been a satellite of Saturn! In his unpublished book, In the Beginning (bk), he proposed that “The conflict between the larger planets resulted in long-stretched filaments ejected by a disturbed Saturn to cross the Earth’s orbit. The hydrogen of the planet combined with the oxygen of the terrestrial atmosphere in electrical discharges and turned into water” and generated the Deluge!
In 1993, Alexander Tollman and his wife Edith published, Und die Sintflut gab es doch. Vom Mythos zur historischen Wahrheit, “which claimed that Noah’s flood was the consequence of a bolide impact about 9500 years ago, and supported the claim through geology (impact craters, iridium, shatter cones, stress lamination of minerals, radiocarbon dating, dendrochronology, a peak of acid in the Greenland ice) and legends and folk traditions.”(bj) Christian O’Brien has endorsed the Tollmans’ ideas(bl).<
A variation on the Moon capture idea was recently offered by the German researcher, Aloys Eiling, in a lengthy illustrated paper(as) on the Graham Hancock website. The additional element is his claim that in the process of capturing the moon, its arrival generated the biblical Deluge and was recent enough to be witnessed by Homo Sapiens and remembered in their mythologies!
Nevertheless, there is one rather disturbing element to be found alongside some of the flood myths, namely that the deluge event was concurrent with the sun seemingly standing still and in some cases, it is recorded that the Moon also appeared to stop(o)(av)! One explanation on offer is that it is a reference to an eclipse(aw). This might be acceptable if it was compatible with other myths from different parts of the world, which does not appear to be the case. Furthermore, it does not explain the association of the stopping of the sun with the global deluge. A very close encounter between the Earth and another large celestial body might.
As I see it, we are left with the two popular explanations for the global flood myths, either a close encounter with an extraterrestrial body that created a megatsunami that was on such a scale that it swept around the globe, perhaps many times before dissipating or the melting of the Ice Age glaciers produced the cyclical bursting of ice-dams and landbridges and the inundation of vast areas of low-lying land. I’m inclined to believe that the balance of probabilities favours the latter explanation, although I find it difficult to accept that gradual deglaciation would or could have generated floods that ‘covered mountains’ (Gen. vii.19)!
Other floods may have been caused by tsunamis resulting from underwater earthquakes and/or storegga. Quite recently it was discovered(bh) 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.
An interesting overview of traditional as well as modern thinking regarding the possible historical reality behind the Deluge of Genesis is presented(ai) by Robert Squillace on the New York University website.
On January 1st 2010 it was revealed(b) that a 3,700-year-old Babylonian tablet which, unlike the biblical record, describes an ark made of reeds, 70 metres in width and round in shape(aj)(ak). This would have been recorded a thousand years before the Genesis story was written down. Understandably, this has caused the knickers of some fundamentalist Christians to become seriously twisted! The discovery has now been expanded on by a cuneiform specialist at the British Museum, Irving Finkel, in The Ark before Noah . Jason Colavito offers an interesting review of the book(d).
Even more radical is the result of a high-tech study of fragments of the Dead Sea Scrolls which suggest that Noah’s Ark was pyramidal in shape(al)! Commenting on this report, Jason Colavito has pointed out that the concept of a pyramid-shaped ark is not new(am).
There is an unexpectedly large number of books written over the last century on the subject of Noah’s Ark that is listed on a specialist website(e). One such offering, resurrected by Jason Colavito(f), provides some comic relief with the claim in 1922 by C. E. Getsinger, who wrote that Noah’s Ark was the Great Pyramid!(g) Even earlier, John Taylor (1781-1864) claimed  that Noah had built the Great Pyramid! Nevertheless, a recently deciphered fragment of the Dead Sea Scrolls has suggested that the Ark was shaped like a pyramid!(h)(i)
Barry Warmkessel also entered the fray with the suggestion that aliens had been involved in the design and construction of the Ark(r)! Nevertheless, that idea certainly competes with the suggestion of Xavier Séguin that the ‘Ark’ of Noah had been an Earth satellite(aa)!
Even more radical is the claim by Hebrew scholar Richard Seary that the Ark never actually existed, but that conventionally accepted understanding of the Genesis text is the result of some incorrect translations(aq). One example is that there is no such material as gopher-wood and that the word ‘gofer’ means lava!
A life-sized replica of Noah’s Ark was due to cross the Atlantic Ocean from Holland in the summer of 2016(an). It was built over four years by a carpenter, Johan Huibers, completing it in 2012. It is 410 feet long, 95 feet wide and 75 feet tall. It weighs 2,500 tons and is said to hold more than 5,000 people at any one time. However, there is no provision for live animals! The replica was sold to Aad Peters, a Dutch artist, who in 2019 brought it to Ipswich in Britain. Unfortunately, it has been impounded by the authorities there as it lacks the appropriate paperwork to permit it to leave. There are also serious concerns regarding its seaworthiness and is also clocking up port fees of £500 a day(ao)(ap).
UBIQUITY OF FLOOD MYTHS
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 consequent immortalisation of these events through locally developed myths, it led to speculation that Noah’s Flood may have been just a regional but a catastrophic event. It is also probable that separate regional inundations would have occurred as deglaciation continued at the end of the last ice age, so when recounted through mythology many centuries later they may appear to refer to a single global event.
The competing concepts of global deluge versus local inundations are discussed in a brief paper(bc) from L. James Gibson, who concluded that “these local floods do not explain important features of the biblical flood.”
Nevertheless, megafloods are not necessarily only caused by tsunamis and melting glaciers. “A 43-day storm that began in December 1861 put central and southern California underwater for up to six months” a catastrophic event that is now generally forgotten. An extensive 2013 article(bd) in Scientific American has full details.
These ancient flood stories are to be found to contain content with a remarkable similarity of detail. It is worth pointing out that none of these legends ever recount the ‘hero’ of their particular tale returning to his former home. One simple explanation for this might be that the original homelands no longer existed. This would not normally be the case if the floods in question were tidal, storm-driven or even giant tsunamis. However, if the inundations were the result of rising sea levels, resulting from the melting of Ice Age glaciers, we could expect two principal effects. The first would have been the gradual submergence of all low-lying flood plains that are now identified as continental shelves. Two of the best known of these would be the Sunda Shelf (Sundaland) and the area stretching from the west coast of mainland Europe across the North Sea encompassing the British Isles and into the Atlantic beyond Ireland. The second effect would have been the dramatic inundation of valleys and basins protected by low landbridges or dams. Again, we have examples, some debatable, such as, the Baltic, the Red Sea, the Persian Gulf, the Black Sea, the Mediterranean and perhaps the Caribbean, the Gulf of Mexico and the Sea of Japan.
An extensive and more general collection of Flood myths can be found on the internet(be). A USGS list of the world’s greatest floods, ancient and recent, is available as a pdf file(bf). Similarly, a website by Mark Isaak offers an extensive overview of flood myths around the world, although the site does not appear to have been updated for some years(bg).
Despite the existence of these huge collections of worldwide flood myths(ay) there appears to be one glaring omission, from all such databases, namely a contribution from Egypt who inexplicably has no such deluge tradition apart from the predictable annual flooding of the Nile. However, there is the Egyptian story of Hathor/Sekhmet(az)(ba) who flooded the land with blood, which some may interpret as a mythological code for water!
The flooding of all these worldwide locations would have occurred quite slowly over an extended period following the last Ice Age, possibly providing the basis for the widespread existence of these flood myths. However, it could not explain the biblical claim that the flood covered mountains.
Many Atlantologists have sought to link the Deluge with the inundation of Atlantis. Egerton Sykes was a keen supporter of the idea. Joseph S. Ellul has interpreted the biblical story to support the idea of a landbridge at Gibraltar, which eventually collapsed when the waters of the Atlantic rose after the last Ice Age. Ellul maintains that Genesis 7:11 ‘All the springs of the Great Deep broke through’ is a reference to the percolation of the Atlantic waters, through the Gibraltar dam, that eventually led to its collapse as the sea level rose or was shattered by seismic or tectonic movements. I find it hard to accept this, because the pressure that is exerted by the Atlantic, would have rapidly changed any such seepage into a major breach and the subsequent collapse of the dam. Gerhard F. Hasel, Professor of Old Testament and Biblical Theology offers a more conventional interpretation of “the fountains of the great deep” in a paper with the same name(ab).
Nevertheless, 2017 finished with renewed interest in Noah’s Ark being generated by media reports(k) of statements emanating from The Geoscience Research Institute, which is sponsored by the Seventh-day Adventist Church, which claims that a 2010 expedition to Mount Ararat in Turkey, carbon-dated timbers found there to 4,800 years ago.
A sceptical 2019 article has looked critically at many aspects of the story of the Ark, including the most commonly offered Turkish site as the resting place of the Ark – “One of the most famous supposedly-Noah’s-ark sites is the admittedly very boat-looking Durupinar site in the Mount Tendurek area in Turkey. According to Atlas Obscura, the site was exposed in the late 1940s after a series of earthquakes and storms.”(an)
The late David Allen Deal was another investigator to propose the Ararat region as the landing place of the Ark, with Mt. Judi as the specific location(o). A more recent article supports his ideas(p). The precise location of the biblical Ararat is a matter of continuing and intense debate(q).
The UK’s Daily Mail added that talking after the initial claims in 2010, Mike Pitt, a British archaeologist, said the evangelical explorers had yet to produce compelling evidence. He said: ‘If there had been a flood capable of lifting a huge ship 2.5 miles [4km] up the side of a mountain 4,800 years ago, I think there would be substantial geological evidence for this flood around the world. And there isn’t.’
In his 2020 book, Apocalypse , Dr Sean Welsh agreed that Noah’s Ark finally rested on Mt. Ararat, but took everyone by surprise by claiming that it was not Ararat in Turkey but Ararat mountain on Crimea’s Kerch Peninsula! Welsh does not explain where Shinar was in relation to his Ararat. Conventional wisdom locates it in southern Mesopotamia, placing them around 2,500 km apart.
However, a more valuable offering was a paper(ab) delivered in 2008 to the Sixth International Conference on Creationism in Pittsburgh, PA by Anne Habermehl. She finished her contribution, Review of the Search for Noah’s Ark, with the following conclusions;
“(1) It would appear that the Ark cannot have landed on Mount Ararat, because scientists have shown that this mountain did not exist until some time after the Flood had ended. (Also, the area that Mount Ararat occupies was probably not yet included in Urartu at that time.)
(2) In light of historical and geographical considerations, Mount Cudi near Cizre, Turkey, is the most likely place where the Ark landed.
(3) It seems doubtful that anyone has actually seen the Ark anywhere in modern times. The alleged sightings all seem to evaporate on careful examination.
(4) It is unlikely that very much of the Ark exists today; it is probable that over the millennia it has decayed, and various scavengers have taken most of it away.
(5) Because of 14C dating problems, it may not be possible to prove that any given samples are or are not the right age to have come from the Ark.
(6) More archaeological work needs to be done if we are ever to reasonably prove the Ark’s landing spot anywhere.
(7) It is probable that no matter what is found in any location, there are those who will remain unconvinced.
(8) Interest in finding the Ark is unabated, and the Ark search will go on.
At the end of the day, we have to face the reality that it may be difficult, or even impossible, ever to prove where the Ark landed. This author would have liked to end on an optimistic note for the soon recovery of a largely intact, proven Ark, but this seems unlikely; and this paper therefore ends, in the words of T. S. Eliot (1925): “Not with a bang but a whimper.”
In 2021, author S.H. Scholar in a short book entitled Heavenly Flood  modestly claimed to have “uncovered history’s greatest secret – the influence of ancient astrology on the development of Noah’s Ark and the Great Flood Tale.” John McHugh has also offered a comparable zodiacal link with the biblical Deluge story in The Celestial Code of Scripture  which has been critiqued by Gary D. Thompson(bm).
(g) The Thomson Review, Thomson, Illinois, July 19th, 1922 – p.3,
(r) Archive 3514
(aq) Fortean Times, April 2014, p.55
* See Atlantis Vol.6, Nos.1,2&3, May, July & September 1953
Checklists have been published by a number of authors that compare the features of Plato’s Atlantis with that of their preferred location and that of other writers. While such lists can appear impressive they suffer from a number of defects. First the lists are drawn up arbitrarily(a) and frequently omit headings that may not suit the theory of its compiler, but might support a competing view. Secondly, another excuse for not including particular items is often done on the grounds that they were just modifications by Plato. Finally, since Plato’s text contains various ambiguities and contradictions, some list headings are capable of more than one interpretation, for example, the location of the Pillars of Heracles or the date of Atlantis’ destruction.
Finally, if the Atlantis narrative is accepted as a mixture of detail from more than one source, possibly separated by thousands of years, it is meaningless to include everything in a single list. An example of this might be where the clues to the location of the Atlantean capital might be based on a very ancient source but the description of its architecture may have been inspired by structures from a different location, possibly from Plato’s own experience. In such a case the two will never be discovered together.
The earliest list of details purporting to match specifics in Plato’s description of Atlantis with a particular theory came in the seventeenth century, when Olof Rudbeck assembled 102 ‘proofs’ that he believed associated Sweden with Atlantis.
In the case of Indonesia, Dos Santos drew up a 32-point checklist(b), which has now been adopted and expanded to 60 points(e) by Dhani Irwanto, who published Atlantis: The lost city is in Java Sea in 2015.
The Atlantis Conference of 2005 concluded with the drafting of a list of 24 criteria(f), which must be met to qualify as Plato’s lost city. Jim Allen initially expanded this list to 34 points(a) and in December 2010 added a further 16 , bringing his new total up to 50 criteria(d), chosen with an obvious bias towards his own Bolivian theory.
The 2005 conference also led to the drafting of the Atlantis Research Charter, which although not a checklist in the sense that I have used it, does provide a rational set of guidelines for researchers to follow, firmly rejecting pseudoscience, dogmatism and abuse for political or religious ends.
The most recent (2016) checklist from Philip Runggaldier, not unexpectedly, points to his chosen location of the Celtic Shelf rather than Minoan Crete as the location of Atlantis. Not, in my mind, a fair comparison.
My book, Joining the Dots, as far as I’m aware, raises for the first time in any detail, the obvious prerequisites for a successful invasion. Obviously Invaders require a powerful army, military intelligence (spies) and the ability to keep supply lines as short as possible. The latter demands that military expansionism is directed at neighbouring territories, a fact confirmed by the manner in which all ancient empires developed. However, when it comes to checklists the need for proximity is conveniently ignored as can be seen by its absence from the lists compiled by advocates of some of the more extreme Atlantis locations, such as, Antarctica, America or Indonesia. At least some Plato’s Atlantis identifiers can be linked with most proposed locations, but if they are not within ‘striking distance’ of ancient Athens, they cannot be Atlantis.
(b) Indonesia – http://www.atlan.org/articles/checklist/ – Link Broken*
The Celtic Shelf in the North Atlantic is accepted as having had large areas, now under water, exposed during the last Ice Age when sea levels were far lower than today due to the enormous amounts of water contained in the glaciers that covered vast swathes of northern Europe and America.
A number of investigators have proposed that these exposed lands were home to Atlantis. Stone Age artefacts have been discovered off the coasts of Britain in recent years demonstrating the man lived on a more extensive landmass at the end of the last Ice Age.
Seventy years ago F. Gidon proposed the Celtic Shelf as a location for Atlantis, but as he ascribed a Bronze Age date to the society, the Celtic Shelf would already have been inundated and since Atlantis had mountains, at least their peaks would have remained visible.
A leading advocate of a Celtic Shelf location for Atlantis is the Russian Viatcheslav Koudriavtsev, who for the past ten years has been promoting his view that a site near to the Scilly Isles was the location of Atlantis. Although he has received government permission to carry out explorations in the area it appears that lack of funding has thwarted his plans to attempt to verify his theory.
Dan Crisp has published(a) a discussion on various location theories and concluded that on balance Koudriavtsev was on the right track when he nominated the Celtic Shelf as the most likely location of Atlantis.
In 2016, Philip Runggaldier added his support for locating Atlantis on the Celtic Shelf, explaining its demise at the end of the last Ice Age being the result of a megadeluge that burst through an ice dam containing a glacial lake in the Irish Sea Basin.