Danger d’Algajola is an advanced boat dive on a steep Corsican reef plateau with drop-offs, canyons, and a lot of blue-water relief. The site combines dramatic terrain with strong fish life, so it rewards slow, controlled exploration rather than a quick swim-through. It can feel drift-style when conditions move, which makes timing and local route choice important. Expect an exposed Mediterranean dive that is best approached with solid depth control and a guide who knows the line.