New Zealand Defence Force Deploys to Remote Penrhyn Atoll for Infrastructure and Health Support Mission
More than 50 New Zealand Defence Force personnel have deployed to Penrhyn, the northernmost and most remote atoll in the Cook Islands, to deliver critical infrastructure, health and hydrographic support to the island's small community of approximately 220 residents.
The deployment, part of the annual Exercise Tropic Twilight humanitarian assistance operation, arrived via Royal New Zealand Air Force C-130J-30 Super Hercules aircraft at the request of the Cook Islands Government and with support from New Zealand's Ministry of Foreign Affairs and Trade.
Remote Location Presents Logistical Challenges
Located 1,365 kilometers northeast of Rarotonga, Penrhyn presents significant logistical challenges due to its remoteness and limited accessibility. The atoll's two settlements, Omoka on Moananui Islet and Tetautua on Pokere Islet, are separated by the largest lagoon in the Cook Islands, spanning 233 square kilometers.
Construction and Infrastructure Projects
New Zealand Army engineers from 25 Engineer Support Squadron, 2 Engineer Regiment, are working alongside five engineers from the Forces Armées en Nouvelle-Calédonie and one engineer from Vanuatu on a range of construction projects. The team will construct and upgrade facilities at Omoka and Te Tautua Schools, improve the roof on the Omoka Market building, install solar water stills, and assist local mechanics with servicing island plant machinery and vehicles.
These infrastructure improvements address critical challenges facing the northern Cook Islands, where water security issues and inadequate infrastructure contribute to continuing depopulation. The northern group accounts for only 6% of the Cook Islands' total population, with residents increasingly moving to Rarotonga or overseas.
Hydrographic Surveys and Health Services
Royal New Zealand Navy personnel from Littoral Warfare Unit HMNZS Matataua will conduct hydrographic surveys of navigational approaches, lagoon transit routes and maritime infrastructure. The updated data will be provided to the Cook Islands Government to improve maritime safety around the atoll.
Health personnel from both the RNZN and New Zealand Army will work with local medical staff to deliver services to the community.
Reinforcing Pacific Commitment
Deputy Commander Joint Forces New Zealand, Brigadier Michael Bassingthwaighte, emphasized the exercise's role in reinforcing New Zealand's Pacific commitment. For more than 25 years, Tropic Twilight has reinforced New Zealand's commitment to the Pacific through practical support and enduring partnerships. We are proud to return to the Cook Islands this year, working alongside local communities and regional partners to deliver infrastructure, health and hydrographic projects that will leave a lasting positive impact for Penrhyn.
The deployment follows last year's Exercise Tropic Twilight operation on Ma'uke in the southern Cook Islands, continuing the pattern of rotating support to different islands across the archipelago.
New Aircraft Fleet Supports Mission
The C-130J-30 Super Hercules aircraft used for the deployment is part of New Zealand's new fleet of five aircraft delivered between September and December 2024, replacing the older C-130H fleet that dated back to 1965. The new aircraft's stretched fuselage provides 30% more cargo capacity than previous models and can carry up to 124 passengers or eight pallets of cargo, with the capability to operate from short or unprepared airstrips.
Additional Support Work in Rarotonga
Before departing Rarotonga for Penrhyn, RNZN hydrographers supported the Cook Islands Government with a boat ramp survey at Avatiu Harbour. New Zealand Army personnel also conducted cleaning and plumbing work on the roof at Aotearoa Marae to enable water collection and assisted the National Environment Service with their reusable plastics sustainability project.
Defence Partnership Framework
The deployment takes place under New Zealand's constitutional responsibility for Cook Islands defence, established through the free association relationship formed in 1965, under which New Zealand provides defence support while the Cook Islands manages its own foreign affairs and internal governance. In April 2026, both nations signed a Declaration on Defence and Security, with the Cook Islands pledging New Zealand would be its "partner of choice" on defence and security matters, and New Zealand resuming NZ$29.8 million in funding that had been temporarily paused.
