Police put out a statement this evening saying they believe there are people who witnessed the crash who are yet to come forward.
"We believe there are people who either travelled through or assisted at the crash scene who may have information that could assist our investigation into the cause of the crash.
"Anyone who witnessed the crash or who was travelling along that stretch of Sunset Road prior to and around this time is asked to contact police."
Police also wanted to hear from anyone who may have dash-cam footage.
Anyone who has information that could assist can call Police on 105 quoting file number 210712/0122.
No arrests have been made in relation to the case and police are still trying to identify and locate the occupants of a second vehicle involved in the crash, a spokesperson confirmed.
As previously reported in the Rotorua Daily Post, bystanders rushed to rescue two people trapped underwater in the car that landed upside down in the creek.