Getting to Kiritimati — Christmas Island in the central Pacific — is half the adventure, and I'll be honest with you: this is not a destination you stumble into. Flights connect via Honolulu on a schedule that feels more like a suggestion than a timetable, and accommodation options are modest at best. But when you drop below the surface here, the effort dissolves almost immediately.
The reefs are genuinely among the least disturbed I've encountered in the Pacific. Coral coverage is dense and largely intact, partly because chronic human pressure has never had a chance to take hold this far from anywhere. Visibility regularly exceeds 30 metres in calm conditions, and you're working depths from the shallows right out to 25–30 metres along the outer drop-offs.
Currents can run strong on incoming tides around the channel mouths, so reading the water before you kit up matters. Grey reef sharks patrol the outer walls in good numbers, and giant trevally hammer bait schools with the kind of aggression that keeps you genuinely alert. Bonefish are the headline act in the lagoon flats, though that's more relevant if you're also carrying a fly rod.
Dedicated dive operators are thin on the ground — a handful of small local guides run day boats, and you should arrange everything well in advance rather than hoping to organise it on arrival. No liveaboard infrastructure currently serves Kiritimati. Snorkellers can access healthy fringing reef from shore in several spots, though the real rewards sit further out.
Reef bleaching has touched sections following recent El Niño events, and recovery is uneven, so temper expectations on the lagoon's inner margins specifically.
Best visited between November and April; open-water certification is sufficient for most sites, though experience handling current is strongly advised.