Blue Cave
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
The Blue Cave earns its crowds the honest way: sunlight enters underwater, bounces off the pale floor, and fills the cavern with a blue glow that looks color-graded even to the naked eye. Sweepers pulse in the dim corners, and the mouth frames snorkelers overhead like paper cutouts. Outside, Cape Maeda's terraces carry anemone gardens, sea snakes, and the odd turtle down tidy coral steps to twenty-five meters, which is where certified divers escape the procession. Go at opening time or on a weekday; by mid-morning in summer the stairway resembles a festival queue, and the glow deserves quieter company.
The moment you come for: The blue glow itself, glassy sweeper swarms, easy cape reef outside the cavern
Topography: Limestone cavern opening off a rocky cape, coral terraces outside
Current: Swell surge at the entrance is the limiting factor rather than current.
Entry: Stairs descend the Cape Maeda cliff to a ladder entry; boats also work the cave mouth. The stairway closes in high swell.
Know before you splash
Hazards: Slippery stairs, surge at the cavern mouth, and heavy swimmer traffic in season.
Who you'll meet
Clownfish & Anemonefish
Lionfish
Nudibranchs
Porcupinefish
For photographers
Wide angle: ★★★★★ · Macro: ★★☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting