Blue Corner is one of those dives that earns its reputation honestly. You clip onto the reef hook, hang horizontal in the current like a flag in a gale, and watch an absurd volume of marine life stream past — grey reef sharks circling below, Napoleon wrasse moving with that unhurried confidence, schools of barracuda and snapper so dense they block the light.
The wall drops to beyond 30 metres, visibility regularly stretching 20–30 metres on a good day, and the sheer biomass still surprises me every time.
The current is the whole point and the main caveat. Blue Corner sits off the southwestern tip of Ngemelis Island and channels some serious water movement — you'll drift at speed, and surge can pin you against coral if you're not paying attention. Reef hooks are provided by most operators and their use is encouraged, though ecologists rightly debate the anchor damage they cause over time.
Be honest with yourself: this is an intermediate-to-advanced site, and divers without solid buoyancy control will cause damage and miss the experience.
Day boats from Koror run 45–60 minutes each way, and most local operators — Sam's Tours, Fish 'n Fins, Palau Dive Adventures among them — include Blue Corner as part of a southern island day trip often paired with Blue Holes or the Chandelier Cave. Liveaboards operate out of Koror too, giving you repeat dives across multiple days, which I'd recommend if you can manage it.
The nearby WWII wrecks add genuine variety between reef dives. Reef health here is noticeably better than much of the Indo-Pacific — Palau's marine sanctuary protections have made a real difference.
Advanced Open Water certification minimum; best diving runs November through April when visibility peaks and seas settle.