The mayor of Tauranga says investigators know what caused the grounding of the container ship Rena and he wants them to release their findings as soon as possible.
It has been almost two months since the ship carrying 1700 tonnes of heavy fuel oil became wedged on Astrolabe Reef, 12 nautical miles from the coast.
Mayor Stuart Crosby says he believes those investigating the incident already know what happened.
He says vessels have a voyage data recorder, like an aeroplane's black box, and the Rena's was removed for analysis within the first few days.
"So I'd suggest they've got a pretty good idea already what's happened and I think they need to explain that to our community as soon as possible, in the context that they're still doing some more work," says Mr Crosby.
The Transport Accident Investigation Commission says information was successfully downloaded from the recorder.
Soon after the Rena ran aground, the commission said it hoped to release an interim factual report - but a date has not yet been set.
More on the Rena incident and how prepared the country was for such a disaster can be heard on Insight just after 8am on Sunday on Radio New Zealand National.