All 13 defendants accused of health and safety breaches in the lead-up to the deadly Whakaari eruption have pleaded not guilty.
There were 47 people on the Bay of Plenty volcano when it erupted on December 9, 2019, most of them international tourists.
Twenty-two people were killed and many others were seriously injured.
Last November, just before the first anniversary of the disaster, WorkSafe announced it was laying charges against 13 organisations and individuals.