Diving in Greece: 19 Sites from Caldera Walls to WWII Wrecks

Greece doesn't have the coral reefs of the tropics, but it has something different: volcanic topography, submerged history, and clear Mediterranean water that hits 26 °C in summer and stays diveable through winter. With 19 mapped sites spread across the Aegean and Ionian islands, there's enough variety to keep a diver busy across multiple trips.

Best dive sites in Greece

• Santorini — Caldera Wall (intermediate, 12–40 m): The submerged rim of one of the world's largest volcanic calderas. Dramatic wall diving with strong visual impact; depth means nitrox is worth considering.
• Zakynthos — Keri Caves (beginner, 5–25 m): A series of sea caves on the southern tip of Zakynthos. Shallow enough for new divers, with good light penetration in the upper sections.
• Crete — El Greco Cave, Akrotiri (intermediate, 8–25 m): A cave system on the Akrotiri peninsula. The entrance sits shallow, but the interior requires comfort with low-light conditions.
• WWII Fighter Plane Wreck (intermediate, max 7 m): A wartime aircraft resting in very shallow water — unusual for a wreck dive, which makes it accessible but also means surge can be a factor in poor conditions.
• Center Action Thassos (intermediate): Thassos sits in the northern Aegean where water temperatures run cooler; this site suits divers who want less-crowded conditions away from the main tourist islands.
• Mononaftis (beginner): A sheltered, entry-level site suitable for first dives or refresher dives.
• Καλλιθέα / Kallithea (beginner): Calm, shallow water that works well for open-water courses and check dives.

When is the best time to dive in Greece

Greece is diveable year-round, but the experience changes significantly by season. Water temperature ranges from 13 °C in winter (February–March) to 26 °C in peak summer (July–August). Most dive centres operate May through October. Visibility tends to be best in late spring and early autumn when plankton blooms are lower and boat traffic hasn't stirred up sediment. Winter diving is possible for those with a 7 mm wetsuit and a preference for empty sites.

Is Greece good for beginner divers

Yes. Several sites — Keri Caves, Mononaftis, Kallithea — are explicitly rated for beginners, with shallow maximums and sheltered conditions. The WWII plane wreck at 7 m maximum depth is also accessible early in a diver's training. Intermediate sites like the Caldera Wall require buoyancy control at depth but are not technical.

What you'll see

Marine life data for Greek sites is still being recorded on this platform. The Mediterranean holds octopus, moray eels, sea bream, grouper, and occasional loggerhead sea turtles (notably around Zakynthos). Expect rocky reef ecosystems rather than coral gardens.

FAQ

Do I need a drysuit in Greece? Not typically. A 5–7 mm wetsuit handles the 13 °C winter minimum; in summer a 3 mm is comfortable.

Is Santorini diving worth it if I'm not an advanced diver? The Caldera Wall goes to 40 m, so the best sections are intermediate territory. If you're a beginner, Zakynthos or Crete offer more suitable options.

Can I dive the WWII wreck without a guide? Most operators require a guided dive for any wreck site regardless of depth. At 7 m it's physically accessible, but local regulations and site-specific rules apply.

Which island has the most dive infrastructure? Crete and Zakynthos have the highest concentration of established dive centres based on the sites mapped so far.

Greece dive map