Scuba Diving in Santorini

Good to Know

• This is fundamentally day-boat diving with short transfers (minutes to about 20 minutes) from shore-based dive centers - there's no need to book a liveaboard to dive Santorini's caldera and volcanic islets.
• A few sites (House Reef/Caldera Beach, Kamari Beach reef, Cathedral, Barracuda Point) are genuine shore-entry dives, useful if you don't want to rely on boat schedules.
• The number of 'named' dive sites varies a lot by operator (some list around 15, others 35-40+), because many operators split the same general areas into multiple sub-sites - treat exact counts as marketing rather than a fixed inventory.
• Peak season (June-August) gets busy and boats fill up, so book dive excursions a few days ahead if visiting then; May-June and September give a quieter, still-warm alternative.
• Deeper wreck and wall sites near the volcano require at least Advanced Open Water certification - check requirements before booking if you're a newer diver.
• Most Open Water certification dives take place inside the Santorini caldera itself — a volcanic-wall/drop-off environment rather than a typical shallow reef, which is part of what makes local diving distinctive.
• Booking ahead in high season (roughly May–October) is worth doing, as courses and trial dives fill up quickly.
• Standard post-dive flying restriction applies here like anywhere: most operators note you shouldn't fly for up to 24 hours after your last dive, which matters given Santorini's short-hop domestic flight connections.
• Dive shops are spread across several beach towns (Kamari, Perissa, Perivolos, Vlychada, Oia) rather than clustered in one spot, so factor in a short taxi/bus ride depending on which village you're based in.