A diver is recuperating at the Devonport Naval Base after suffering decompression sickness during a dive.
The man - aged in his mid-20s - was diving off Great Mercury Island, off the coast of the Coromandel Peninsula yesterday.
Auckland Westpac Rescue Helicopter crewman Karl Taylor said they winched the man off a boat just after 7pm.
The diver was not alone at the time, and had been diving to depths of 25 to 30 metres.
They treated the patient with high-flow oxygen and fluids to rehydrate him, Mr Taylor said.