A woman is in critical condition after a car with two occupants plunged into the Waikato River in Cambridge.
Emergency services were called to the scene, at the intersection of Shakespreare St and Tirau Rd, shortly after midday.
The woman was believed to be dead at first, however after significant medical intervention, including approximately one hour of CPR, she regained a pulse.
She was taken to hospital and remains in intensive care in a critical condition.
The other person has been taken to hospital with moderate injuries.
Diversions are in place and are expected to be there for at least a couple of hours, police say.
The Serious Crash Unit is investigating.