Still, their doom appears to have come from the sea. Around 1500 BC, all of Crete's towns and palaces were ravaged by fire; Minoan civilization was left in ruins. Some scholars originally believed that the great earthquakes of Crete caused the Minoan demise. Others placed the cause with civil unrest or invasion by the warlike Mycenaeans from the Greek mainland. Indeed, there is evidence that after 1500 BC, the Mycenaeans did occupy what was left of the city of Knossos.
But another group of archaeologists holds that the Minean destruction came from a distance. About seventy miles north of Crete is a rugged crescent called Santorin, after Saint Irene. With four smaller isles, Santorin describes a shattered ring of rocky outcroppings rising from the sea. Four thousand years ago, these were part of the cone of a great volcano called Thera, with villages settled along its hard flanks until, near the year 1500 BC, Thera literally blew itself apart. Destructive waves called tsunamis struck Crete's coast within half an hour of the eruption; walls of water hundreds of feet high swept well inland, ripping away everything in their path. The fires that destroyed Cretan towns rained down from the sky, along with millions of tons of ash that blotted out the sun and suffocated farms and villages. Its store of lava temporarily exhausted, the volcano caved in upon itself, leaving no trace beyond the islands that still mark its broken rim.
Crete - Knossos