The search for a father who went missing after an attempted rescue went wrong at the edge of Lake Wakatipu continues today, with specialist divers set to join the operation.
Emergency services were first called to Lake Wakatipu at Glenorchy about 2.55pm yesterday.
A man entered the water to assist someone and failed to exit the water himself, a police spokeswoman said.
Boats were searching on the water and helicopters were called to conduct aerial sweeps, the spokeswoman said.