A person is being treated for injuries after the vehicle they were driving went off a cliff near Raglan.

Northern fire communications shift manager Jaron Phillips said firefighters were called to Okete Rd at 10.46am after reports of a car plunging down a bank.

The car landed in the Okete Stream, eventually becoming fully submerged.

However, the sole occupant managed to get out safely out.

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The driver was being treated by St John Ambulance staff but it's unclear on the nature of the injuries.

The vehicle remains under water, Phillips said.