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It could be six months before a preliminary report into the cause of Friday's fatal boat crash is known.
Blenheim locals Anton Lewis Perano and Troy Anthony Climo, both 38, were killed in the crash when the boat they were on hit a moored vessel in the Marlborough
Sounds. Four others were injured.
Transport Accident Investigation Commission investigator Captain Iain Hill said everything would be looked at when trying to establish the cause of the accident.
"Any little avenue that opens up to us, we will investigate to try and find the true cause of the accident," Captain Hill said.
He said sun strike will be looked at, people who were on board will be talked to and the boats will be examined.
Earlier, one of the accident's four survivors said she would continue to work for the company that owned the vessel.
Lisa Agate, 23, from Dunedin, suffered a broken cheekbone and broken wrist after the 11-metre aluminium runabout Shikari she was on collided with a moored ex-naval patrol vessel at Waikawa Bay, near Picton.
Maurice Alfred Liberona, 48, and 23-year-old Kane Craig Aitken, also of Blenheim, were flown to Wellington Hospital on Friday and remain in a serious condition in the intensive care unit.
Another passenger, Juan Carlos Vargas, 32, of Blenheim, was released from Blenheim's Wairau Hospital on Friday night.
The group were King Salmon workers returning home after checking salmon farms in the Queen Charlotte Sound.
Miss Agate, a diver for the company, told the Otago Daily Times, she hoped to be out of hospital some time this week, and to return to Dunedin.
She also planned to keep working at the salmon farm despite the incident.
Miss Agate was standing at the back of the boat with one of the men who died when the collision occurred.
"I can remember this big bang. I swung around to see what happened and ended up crashing through an open doorway," she said.
"I cut my hand but I don't know how. By moving, I got in the position to move into the doorway."
She was knocked out for about 10 minutes.
She regained consciousness with blood pouring from her arm.
"I was just trying to put my jersey on top of my arm to stop the bleeding. I could not move to help the others."
Miss Agate said it seemed to be a completely normal 20-minute journey.
The day was sunny and calm, and the boat was about five minutes away from land when the accident occurred.
Miss Agate said the boat was travelling at a moderate pace, although she did not know the exact speed.
A number of investigations are under way into how the accident occurred.