Police are hoping to recover the car linked to the disappearance of 11-year-old Michael Zhao-Beckenridge on Wednesday.
Police have been searching for Michael and his stepfather John Beckenridge since the pair went missing on March 13.
Michael was picked up by Mr Beckenridge from his Invercargill school during lunchtime. Mr Beckenridge had a parenting order against him forbidding contact with the boy.
There has only been one confirmed sighting of the pair since their disappearance and Mr Beckenridge's car, a blue Volkswagen Touareg, has since been found at the bottom of Curio Bay in Southland.
Track marks at the top of the cliff overlooking the bay led police to believe the car was driven at top speed off the cliff.