The Prime Minister has poured cold water on a Royal Commission into Whakaari, which could leave unanswered questions about the rescue and recovery mission.
WorkSafe has completed its investigation into the disaster, but only up until the point of the eruption.
It has charged 13 parties, including the National Emergency Management Agency and GNS Science.
Ministers are now at odds over whether scrutiny should be applied to the likes of emergency services and the NZDF, and the way they responded in the minutes and hours immediately after the explosion.
Our political reporter Jo Moir has this story.