Rutaki Passage - Rarotonga

Tankah II isn't your typical cenote dive, which is precisely why we rate it so highly. Forget the deep, dark caverns; this site is an open, sun-drenched pool that acts as a natural aquarium, perfect for those days when you want something relaxed but still full of interesting finds. We love dropping in here after a more challenging cave dive, letting the light spill down onto the limestone formations and the resident fish. What sets Tankah II apart is the sheer volume of small, intricate life. We’ve spent whole dives just combing the edges, spotting Pearl Blennies peeking from crevices, Roughhead Triplefins flitting about, and often, several types of moray eels, including the patterned Chain Moray, tucked away. The clarity here is usually superb, letting you really appreciate the details. It's an excellent spot for photographers looking for macro subjects, or newer divers wanting to build confidence in a calm, clear environment before tackling the deeper cenotes. Don't expect dramatic swim-throughs, but do expect a peaceful dive with plenty of small wonders.

Location
Rarotonga, Cook Islands, Central & South Pacific
Coordinates
-21.264200, -159.804800
Type
reef

Best Time to Dive in Rarotonga

The warmest water temperatures in Rarotonga occur in January, averaging 26.5°C. The coolest conditions are in December at 26.5°C.

Monthly Water Temperatures

  • January: 26.5°C (air: 24.8°C)
  • February: 26.5°C (air: 25.2°C)
  • March: 26.5°C (air: 25.5°C)
  • April: 26.5°C (air: 25.0°C)
  • May: 26.5°C (air: 24.2°C)
  • June: 26.5°C (air: 22.8°C)
  • July: 26.5°C (air: 22.3°C)
  • August: 26.5°C (air: 21.7°C)
  • September: 26.5°C (air: 22.0°C)
  • October: 26.5°C (air: 22.1°C)
  • November: 26.5°C (air: 22.6°C)
  • December: 26.5°C (air: 24.0°C)

Nearby Dive Sites in Rarotonga

Nearest Dive Centres to Rutaki Passage

Marine Life in Rarotonga

Home to 143 recorded species including 102 reef fish, 14 hard corals, 10 sea snails & nudibranchs, 7 sea cucumbers, 2 sea urchins, 2 starfish.

Notable Species

Recommended Packing List for Rutaki Passage

Based on average water temperature of 26.5°C.

  • Shorty or Rashguard - warm 26°C water needs minimal exposure protection
  • Mask - essential for every dive
  • Fins
  • BCD - buoyancy compensator
  • Regulator - your most safety-critical piece of gear
  • Dive Computer - tracks depth, time, and NDL
  • Surface Marker Buoy (SMB) - essential for boat pickups
  • Dive Torch - useful for crevices and colour at depth
  • Underwater Camera - capture your diving memories

Frequently Asked Questions

What is the typical diving depth at Rutaki Passage?
The maximum diving depth at Rutaki Passage is 19 metres. While the passage features narrow, vertical canyon walls starting just below the surface, divers can explore down to this maximum depth.
What kind of marine life and underwater features can divers expect to see at Rutaki Passage?
Divers at Rutaki Passage can expect to encounter impressive underwater features like narrow, vertical canyon walls and exciting swim-throughs. The passage is also home to a variety of marine life, including frequently seen turtles, whitetip reef sharks, and eagle rays. Additionally, large schools of fish often gather at the entrance, and moray eels are common residents here; explore more about these species in our wildlife database.
How challenging is diving at Rutaki Passage, and is it suitable for all experience levels?
Diving at Rutaki Passage is rated as intermediate difficulty, primarily due to the frequent strong currents. While it offers an exciting experience, it is not suitable for absolute beginners. Divers should have some experience managing currents to safely enjoy this site.
What is the best time of year or specific conditions to dive Rutaki Passage for an optimal experience?
Information regarding the best time of year or specific conditions for an optimal diving experience at Rutaki Passage is not available in the provided data. For general guidance on seasonal diving, please refer to our When to Dive section.
What dive certifications or level of experience are recommended or required to dive Rutaki Passage?
Given that Rutaki Passage is classified as an intermediate difficulty dive site, it is recommended that divers possess a certification level and experience suitable for navigating frequent strong currents. This typically means an Advanced Open Water certification or equivalent experience with drift diving is advisable.
What are the typical current conditions and visibility like when diving Rutaki Passage?
Rutaki Passage is known for its frequent strong currents, which contribute to an exciting dive experience. Visibility is usually limited to 10 to 15 metres, adding to the passage's natural spookiness, although the average visibility for the site is noted as 22 metres.