Workers pose for the photographer in an Auckland Metropolitan Drainage Board sewerage tunnel between Ōkahu and Hobson bays at Ōrākei, Auckland, in 1913. The tunnel was egg-shaped with the narrow end at the bottom. This shape ensured that sewage still moved along the tunnel under a wide range of water flows.
Te whakamahi i tēnei tūemi
Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.