Let me guess. Ancient Minoan zombies come back from the dead?
I hope not.
It's not zombies I'm concerned about. Just the other day there was a post about vulcanologists checking for magma underneath 5 volcanoes in the Cascades. They found indications of magma under all of them, even those that were supposedly "extinct". Is there a pool of magma under Santorini? Probably.
Volcanic eruptions are often accompanied or preceded by earthquaakes, it's one of the prime predictors of volcanic activity. It's possible an eruption is imminent --- today or a century from now, I don't know.