A man is in a critical condition after hitting his head during a dive into Manukau Harbour.
The man, in his 30s, was knocked unconscious from the impact with an object when he dived into the water at Little Huia Beach at 1.15pm, said a Fire Service northern communications shift manager Jarron Philips.
Fire and ambulance staff were at the scene and a rescue helicopter was to transport the man to hospital, he said.