An Anzac remembrance service is planned at a once-secret coastwatchers' base in the remote Auckland Islands.
At Easter, HMNZS Wellington will take Department of Conservation staff and volunteer builders to the chilly archipelago, 360km south of Stewart Island.
The expedition is going to Ranui Cove, where it will complete urgent repairs to a deteriorating coastwatchers' base and lookout.
The planned service is weeks before official Anzac commemorations, but those involved want to honour the coastwatchers at a site where they served during World War II.
DoC staff, five volunteer builders and an adviser from Heritage New Zealand are determined to recall the contribution of men who "guarded the back door to New Zealand".