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The Poor Knights Islands have been a no-take marine reserve since 1981 and uninhabited since the 1820s, creating over 40 years of complete marine protection. A subtropical current from the Coral Sea keeps water temperatures warmer than the mainland coast, supporting species normally found in tropical waters alongside temperate New Zealand species. Jacques Cousteau ranked the Poor Knights among the world's top ten dive sites for this unique blend of biodiversity and dramatic underwater topography.

Rikoriko Cave is the world's largest known sea cave, large enough to fit a symphony orchestra and audience inside. While it is primarily explored by boat and snorkellers, divers can explore the cave entrance area and the surrounding underwater cliff faces. The cave interior features bioluminescent organisms that create an ethereal glow on the walls and ceiling, especially in low light conditions.

The Poor Knights Islands are accessed exclusively by boat from Tutukaka Harbour, approximately 30 kilometres northeast of Whangarei on the North Island. The boat ride takes about 40-50 minutes. Several dive operators run daily trips during the diving season, typically offering two-tank dive trips. Landing on the islands is prohibited to protect the native wildlife, so all diving is done from the boats.