Blue Cave
Conditions
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Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
Blue Cave is an underwater cave on Alonnisos, described as the most famous sea landmark of the island and formerly a pirate raid bay. It is known for the shades of turquoise that the reflected light creates on the roof of the cave, and for its unique underwater landscape.
The dive follows an impressive vertical wall, initially down to 20 metres, before returning to the cave entrance. The cave then gradually reveals its innermost parts, down to a depth of 30 metres.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Mauve StingerPelagia noctilucaReported here · unconfirmed
Groove Burrowing UrchinBrissus unicolorReported here · unconfirmed
Violescent Sea-whipParamuricea clavataReported here · unconfirmed
Mediterranean Monk SealMonachus monachusObserved near here · iNaturalist
Fried Egg JellyCotylorhiza tuberculataObserved near here · iNaturalist
Mediterranean Red Sea StarEchinaster (Echinaster) sepositusObserved near here · iNaturalist
Mediterranean DamselfishChromis chromisObserved near here · iNaturalist
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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