Police divers return to Curio Bay in the Catlins today as they hunt for Mike Zhao-Beckenridge and his stepfather.

They'll be assisted by a helicopter and an underwater camera.

There are signs a vehicle belonging to John Beckenridge has gone over a cliff at Curio Bay. Debris is littered nearby, and police are trying to ascertain if anyone was inside.

It's a fortnight since the 11-year-old Invercargill boy was picked up his step-father from school.