This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
North Head Tunnel System I. Part of the tunnel systems under the South Battery area of North Head in Devonport North Shore City New Zealand Much of the system is publicly accessible en br original text Own picture Ingolfson en br original upload log page en NorthHeadTunnelSystemI Ingolfson bytes no The tunnel systems under