Palmerston Atoll

Getting to Palmerston is genuinely half the adventure. This tiny atoll sits roughly 450 kilometres northwest of Rarotonga, has a population of around 60 people — nearly all descendants of one English settler — and receives perhaps a handful of visiting yachts each year. There are no dive operators, no liveaboard services, no day boats running scheduled trips.

If you're diving here, you've arrived on your own vessel or hitched a passage on a cruising yacht, and you've sorted your own kit and air fills well in advance.

What greets you underwater makes the effort worthwhile. The outer reef walls drop sharply from two or three metres down to beyond 30, with visibility frequently exceeding 40 metres in settled conditions. The reef itself is in genuinely good shape — minimal bleaching compared to more trafficked atolls, partly because human pressure is so low, partly because the surrounding ocean is deep and relatively cool.

Currents can be strong and unpredictable on the windward side, so you read the water carefully before committing to any drift section.

The marine life reflects the isolation. Grey reef sharks patrol the drop-offs in numbers that feel refreshingly honest. You'll see large schools of trevally, Napoleon wrasse, and a density of reef fish that reminds you what undisturbed systems look like. Manta rays pass through seasonally, and the atoll's passes funnel nutrients that keep everything looking well-fed and healthy.

Entry is through one narrow pass, and landing arrangements require permission from the island council — yachties will know to radio ahead and respect local protocols around fishing grounds and anchoring.

Best attempted between April and October in settled southeast trades; open-water certification minimum, but strong buoyancy control and experience reading surge are essential.