www.aa.co.nz · Tourism Editorial
Independent travel editorial with boat access, current, kelp-reef and wildlife notes for the Mercury Islands group.
Double Island is a boat-access kelp-reef dive in the Mercury Islands.
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Local Whitianga operators typically choose sheltered Mercury Islands sites and handle the boat run.
Boat-access kelp-reef dive in the Mercury Islands with walls, pinnacles and small caves. Double Island is an easy-to-navigate temperate site with lots of fish life and sheltered options from the wind, so it works well as an add-on while diving the Coromandel islands. Plan for temperate water, weather-dependent exposure and a boat schedule that favors calm island days.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Best Season
Summer for the most frequent boat trips, with winter weekend access still available.
Typical Conditions
Temperate offshore kelp-reef diving with walls, pinnacles and small caves; sheltered coves are often available from the wind.
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Small caves mean overhead awareness and good buoyancy matter; stay within training and comfort limits.
Access Restrictions
Boat access only; the smaller Mercury Islands are protected reserves and landing is not permitted.
Legal Notes
The smaller Mercury Islands are nature reserves, so planning should assume boat access only.
Community notes to help plan your visit.
Scuba Diving
Entertaining scuba dive featuring walls, pinnacles, and small caves, and is described as easy to navigate.
Freediving
Not a dedicated freedive site; it is normally dived as a scuba reef.
Snorkeling
Snorkeling is only possible when conditions allow; the site is mainly a scuba dive.
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at DOUBLE ISLAND.
Directional shelter context for incoming swell.
Species commonly reported at this site, with direct links into their wildlife guides.
Community dive logs and visit reports for this site.
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Average conditions based on logged dives & visits.
Planning answers for access, conditions, timing, and site logistics.
Last Updated
Research Sources
Independent travel editorial with boat access, current, kelp-reef and wildlife notes for the Mercury Islands group.
Trip page with Double Island trip frequency and all-levels access context.
Know this site? Improve Spot Details.
Mercury Islands reef with cracks, a swim-through arch, and kelpy rock structure.
Green Island is a boat dive on a rugged Mercury Islands outcrop.
Exposed kelp reef off Great Mercury Island.
Sheltered lagoon with a deeper exposed outer reef beyond.
Sheltered shore dive with kelp, sand and a nursery area.