Premise: Santorini . The main island slopes downward to the Aegean Sea . It is the most active volcanic centre in the South Aegean Volcanic Arc , though what remains today is chiefly a water-filled caldera . The South Aegean Volcanic Arc is a chain of volcanic islands in the South Aegean Sea formed by plate tectonics as a consequence of the subduction of the African tectonic plate beneath the Eurasian plate .
Hypothesis: Santorini is not in the Aegean Sea.
Label: CONTRADICTION