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Hotels, dive operators, gear, and how to get here are on the Niue Reef location page.
Overview
A cavern carved beneath Niue's limestone reef flat, reached by boat about 30 metres off Avatele Beach on the southwest coast. Divers drop from the reef top near 8 metres through swim-throughs to around 20, where ledges and overhangs shelter katuali — the black-and-white banded sea krait found nowhere on Earth but Niue. The venomous yet placid snakes thread between divers alongside Napoleon wrasse, regal angelfish, whitetip reef sharks, barracuda, moray eels and turtles. With no rivers and porous limestone shedding almost no sediment, visibility routinely runs 30-60 metres and can reach 80. From July to September migrating humpback whales calve offshore and their song carries into the cavern.
Briefing note
Katuali are highly venomous but non-aggressive — observe, never handle them. Niue has no recompression chamber, so dive conservatively; the nearest is in New Zealand. Boats launch by crane at Alofi wharf and trips depend on west-coast swell. Scuba is seasonal — the local operator typically closes from around December to February.
What you'll see
5 species curated- year-roundKatuali (banded sea krait)Peak: Apr · May
- seasonalHumpback whalePeak: Jul · Aug · Sep
- year-roundNapoleon wrasse
- year-roundWhitetip reef shark
- year-roundGreen turtle
Conditions
| Month | Water | Visibility | Current |
|---|---|---|---|
| Jan | 28–29 °C | 25–60 m | moderate |
| Feb | 28–29 °C | 25–60 m | moderate |
| Mar | 28–29 °C | 25–60 m | mild |
| Apr | 27–29 °C | 25–60 m | mild |
| May | 26–28 °C | 30–80 m | mild |
| Jun | 25–27 °C | 30–80 m | mild |
| Jul | 24–26 °C | 30–80 m | mild |
| Aug | 23–25 °C | 30–80 m | mild |
| Sep | 24–26 °C | 30–80 m | mild |
| Oct | 24–26 °C | 30–80 m | mild |
| Nov | 25–27 °C | 25–60 m | mild |
| Dec | 26–28 °C | 25–60 m | mild |
Season calendar
Peak season highlighted · current month outlined
Next step
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