SCUBA diving in Santorini is not the same as in the Carribean or Red Sea, as there are no corals, and the fish life is not as abundant or diverse. Nevertheless, a diver would have a really enjoyable time and unique experience diving inside a volcano caldera.  The dives include a dive through a cloudy sulphur layer, and then revealing very clear water beneath, along with possible venting through then sandy bottom from the volcano. Other dives include a beautiful and exciting wall dive where the bottom gives way to the dark blue depths, and feeding fish near the shore.