Lustica Peninsula, Bay of Kotor dive sites

The electric blue glow is created when sunlight enters through the submerged portion of the cave entrance and refracts through the water, illuminating the cave interior with an intense blue light. The effect is strongest when the sun is high and the water is calm, making midday dives during summer the optimal time. The white limestone walls and sandy bottom amplify the effect by reflecting the blue light throughout the chamber.

Open Water certification is sufficient for the main cave chamber, which has a maximum depth of about 15 metres and maintains natural light throughout. The surrounding reef dives extend to 20 metres and are suitable for all certified divers. Comfort with enclosed spaces is helpful when entering the cave, but the passages are wide and natural light is always visible. All dives are guided by local operators based in Herceg Novi or Lustica.

Montenegro's Adriatic coast offers very similar marine life and water conditions to southern Croatia, with crystal-clear water, Mediterranean reef species, and warm summer temperatures. The key advantage is that Montenegro's dive sites are far less crowded, as the country's diving industry is still developing. Prices are generally lower than Croatia, and sites like the Blue Cave and the Lustica Peninsula reefs are often dived with small groups or even privately. The Bay of Kotor also offers unique wreck diving opportunities.