Several people have been extracted from the water after scaffolding collapsed in east Auckland on Tuesday morning.
The fire service says three people plunged into Panmure Lagoon when scaffolding under the Panmure Bridge gave way.
A fourth person was trapped flat on his back on a beam running under the bridge.
He was described as "waiting patiently" for fire services to extract him.
Video captured by Newshub shows a fire truck parked up under the bridge. The truck extended a mechanical ladder across piles of collapsed scaffolding in order to reach the trapped man.
He was able to step onto the ladder and be winched to safety.
The fire service says the three people who fell into the water have also been rescued.
The cause of the scaffolding collapse is unknown, according to the fire service.