An interim report on the grounding of a container ship in the Bay of Plenty will be released by the Transport Accident Investigation Commission (TAIC) on Thursday morning.
The Rena struck Astrolabe Reef off Tauranga on 5 October last year, spewing oil and containers into the sea and polluting beaches.
The ship's captain and navigation officer pleaded guilty last week to altering the ship's original passage plan, GPS log book and other documents.
The commission says it will set out the facts of the accident, but will not analyse why it happened as this will be covered later in its final report.
It says the inquiry is independent of Maritime New Zealand's regulatory action, environmental enforcement action, or financial claims relating to the grounding.