“Fenz advised the evacuation of faculty buildings as a precaution while the substance was safely removed.”
Video of the explosions show dirt flying into the air, and a crater about 1 metre in diameter left behind.
A Fenz spokesperson told the Herald they were called to the scene in the Medical Sciences building at 1.42pm after reports of the hazardous substance.
There were four fire trucks, including a hazardous materials command unit on site.
Police and Fenz cordoned off a portion of the domain across the road to ensure the safety of all those involved, a police spokesperson said.
The task was completed at around 4pm, and the buildings have reopened.
Rachel Maher is an Auckland-based reporter who covers breaking news. She has worked for the Herald since 2022.