The Middle Neolithic period around 5000 years ago, was a time of dramatic climate and sea level changes all around the world. Welsh legends remember lost cities beneath the Irish Sea; and Irish myths recall an otherworld, a golden age when the eastern Irish Sea was a flowery plain inhabited by a golden-haired race of men. This book suggests that Plato's Atlantis is the same place that is remembered in these Celtic myths. Paul Dunbavin sets out in his controversial theory that Plato's Atlantis myth remembers the submergence of a Neolithic civilization around the shores of the British Isles. He argues that this cataclysm resulted from a change in the Earth's axis consequent upon a comet impact around 3100 BCE.