The secrets of WWII tunnels
Once shrouded in secrecy, Stony Batter Tunnels was the headquarters of Auckland’s defence network, built during World War II in response to the very real threat of a Japanese invasion.
Hidden inside a hill at the far eastern end of Waiheke, it’s a true fortress: a system of long tunnels linking three gun emplacements, ammunition stores, operations and engine rooms.
Decommissioned, and emptied of equipment in 1957, the tunnels were abandoned for more than 60 years, left dark and damp, littered with dead sheep and pu¯ keko, an unofficial adventure playground for locals.
A community group worked hard on its restoration, but the Department of Conservation eventually closed the tunnels for safety reasons.
Now they have been returned to their pristine original condition, and guides take small groups through to appreciate the immense effort required for their construction, and to learn about their counter bombardment role.
Why go?
Because there are 1200 metres of hand-dug tunnels here, waiting to be explored and explained. On the hour-long tour, you’ll see the bomb blast chamber, inspect the arty impressions of timber and steel on the concrete walls, climb and descend many steps, and stand in complete darkness and silence, 42 metres below ground.
You’ll enter the pit built for the immense 9.2-inch gun, its barrel almost 12 metres long, able to rotate 360 degrees and fire a missile 32 kilometres, well over the horizon. The guide will tell you how it was operated and that, after all that work installing it, it was never fired in aggression.
In the plotting room, a map shows the observation posts and gun emplacements around Hauraki Gulf. In the engine room, there are diesel engines similar to those that supplied power to the complex.
Insider tip
Wear suitable shoes for the 800m walk from the car park, through the spectacular volcanic boulder field, to the tunnels. Torches are provided.
On the way/nearby
There are walks over the reserve to nearby bays. Or, since you already have your car covered in dust, carry on along the unsealed road to Man O’ War Vineyards to enjoy a tasting while you look out over the pretty bay and imagine what it was like in wartime, with rows of tents for soldiers and labourers, and heavy equipment being unloaded at the wharf.
How much?
The reserve is free to explore, but to enter the tunnels costs $25 for adults, $15 youths (12-16 years) and $10 child. Under-5s are free. They are open Wednesday to Sunday, 10am to 5pm, with tours on the hour, including on Waitangi Day and Auckland Anniversary Day. There’s no public transport to Stony Batter, a 40-minute drive from Oneroa, so hire a car at Ma¯tiatia or take a taxi.
Best time to go
Choose a fine day to enjoy the views over the boulder fields en route to the tunnels. Check the website for upcoming art exhibitions, performances and stargazing. stonybattertunnels.nz.