A 10-metre-long historic waka has been uncovered during excavation work on the Ara Tuhono Puhui to Warkworth motorway project.
The waka, still attached to a trunk of a Kauri tree, was made near the Okahu inlet north of the Johnstone's Hill Tunnel on State Highway 1 on April 16.
New Zealand Transport Agency's senior manager of project delivery Chris Hunt said the discovery was made during piling work for a viaduct on the new motorway.
"A digger identified a wooden object under the surface of the inlet. The mud around the object was carefully removed exposing a large rectangular wooden object that extended across the excavation," Hunt said.
Hunt said NZTA had strict protocols for when unidentified artefacts were uncovered.