Premise: Santorini . It is the largest island of a small , circular archipelago which bears the same name and is the remnant of a volcanic caldera . Santorini is essentially what remains after an enormous volcanic eruption that destroyed the earliest settlements on a formerly single island , and created the current geological caldera . It is the most active volcanic centre in the South Aegean Volcanic Arc , though what remains today is chiefly a water-filled caldera . The region first became volcanically active around 3 -- 4 million years ago , though volcanism on Thera began around 2 million years ago with the extrusion of dacitic lavas from vents around the Akrotiri . The island is the site of one of the largest volcanic eruptions in recorded history : the Minoan eruption ( sometimes called the Thera eruption ) , which occurred some 3,600 years ago at the height of the Minoan civilization .
Hypothesis: Santorini is the site of a an active volcano.
Label: ENTAILMENT