I saw a documentary called "Who was Moses" a while back (can't remember if it was National Geographic or Discovery), and they put forward a hypothesis that the eruption/explosion of Santorini was responsible for some of the seemingly supernatural occurances in the story of the flight from Egypt, most notably falling ash, and a tsunami causing a massive tidal effect around the Nile Delta, letting Moses cross and drowning the Egyptians (the programme alleged that the Red Sea was a mistranslation, and that Moses in fact crossed the Reed Sea or Sea of Reeds, which was in the delta).