Northern Arch is an advanced dive site located at RikoRiko Cave in the Poor Knights Islands. This site features a narrow archway measuring 12 to 15 metres in width. Divers navigate a wall and cave topography with depths ranging from 25 to 60 metres, averaging 40 metres. Access is by boat only, and the site is subject to moderate currents, surge, and potential down currents. Visibility typically fluctuates between 10 and 30 metres. Due to the depth and environmental conditions, this site is suited for experienced divers. Hazards include boat traffic, decompression requirements, nitrogen narcosis, and surf near the surface.

Middle Arch at RikoRiko Cave is a naturally formed archway located on the northern island of Tawhiti Rahi. This intermediate dive site features a varied topography including drop-offs reaching depths of 40 metres and an underwater air bubble cave. The site ranges from 7 to 70 metres in depth, with an average of 18 metres. Divers experience mild currents and visibility between 10 and 30 metres. Access is strictly by boat, and the site is suitable for night diving. Water temperatures fluctuate between 15C and 18C throughout the year. Due to the presence of overhead environments and deep sections, this site requires appropriate training and experience.

Mao Mao Arch is a reef and cave site located at RikoRiko Cave in the Poor Knights Islands. Divers and snorkellers access this site by boat, exploring depths between 7 and 20 metres with an average of 15 metres. The site features an overhead environment within the arch, requiring comfort in enclosed spaces. Visibility ranges from 10 to 30 metres, though moderate currents can strengthen inside the cave. Marine life recorded here includes wrasses, scorpionfish, clown doris, pufferfish, blue-spotted wrinkle dorids, kingfish, pink maomao, banded coral shrimp, and John Dory. Rarer sightings include mosaic moray, smooth ray, green moray, eagle ray, and long-nosed fur seal. Night diving is also available.

Landing Bay Pinnacle is a diverse site featuring a reef, wall, and kelp forest that rises from 45 metres to within 5 metres of the surface. This advanced dive offers a full water-column experience with visibility typically ranging between 15 and 30 metres. Divers encounter mild currents, though surge and swell require attention in shallower sections. Given the depth, careful gas management and a conservative ascent plan are essential. Access is by boat only, and divers should deploy a surface marker buoy well before ascending due to active boat traffic. Water temperatures remain between 16 and 19 degrees Celsius, making a 5 mm wetsuit or drysuit appropriate.

The Pinnacles, located near RikoRiko Cave, features a complex topography of rocky spires and walls draped in kelp forest. Divers can explore depths between 18 and 25 metres, with visibility typically ranging from 10 to 20 metres. The site experiences mild currents, though surges can occur near the walls. Due to water temperatures between 16 and 21 degrees Celsius, appropriate thermal protection is recommended. Access is by boat only, and divers should remain vigilant regarding boat traffic in the area. Always deploy a surface marker buoy upon ascent and check local marine reserve conditions before diving.

Fraggle Rock is a marine dive site situated near RikoRiko Cave in the Poor Knights Islands, New Zealand. The site features a consistent depth of approximately 18 metres. Conditions at this location vary, with water temperatures ranging from 16C in the winter months to 21C during the peak of summer. This site is suitable for beginner divers looking to explore the underwater topography of the region. Access to the site is typically via boat given its location within the Poor Knights Islands group.

The Gardens Pinnacles, located near RikoRiko Cave, offers a diverse underwater landscape featuring pinnacles, reef structures, and kelp forests. Divers can explore depths ranging from 5 to 15 metres, with an average depth of 12 metres. The site is accessible only by boat and is suitable for beginners, though divers should be aware of potential surge and strong currents. Visibility typically ranges between 10 and 30 metres. Marine life frequently encountered includes wrasses, scorpionfish, and clown doris. Less common sightings include mosaic moray, green moray, smooth ray, eagle ray, pufferfish, pink maomao, kingfish, and the occasional long-nosed fur seal, southern rock lobster, or banded coral shrimp.

Nursery Cove is a sheltered, current-free site located at RikoRiko Cave in the Poor Knights Islands. Featuring both reef and artificial structures, it is well suited for beginner divers. Depths range from 4 to 18 metres, with an average of 10 metres. Visibility typically spans 10 to 30 metres, allowing for clear observation of the site topography. Water temperatures fluctuate between 16 and 21 degrees Celsius throughout the year. Boat access is required, and the site is suitable for night diving. Divers should remain aware of boat traffic and potential entanglement risks when exploring the cave and wreck areas.