A man is being treated for hypothermia after his car went into Lough Neagh in the early hours of Sunday morning.
Shortly before 12.30am, police received a report that a car was partially submerged after coming off the Lough Road in Antrim.
Weather conditions were poor, with rough waters and high winds and when police arrived the car had taken on a substantial amount of water.
The driver was suffering from hypothermia and was unresponsive, so four officers entered the water to rescue the man and to search the car for other passengers.
A senior officer has commended their bravery.
Inspector Claire Gilbert said: "The swift action of the police officers involved who, in treacherous conditions placed themselves at personal risk, were key to saving this man’s life.
"This is an excellent example of the commitment of officers in keeping people safe which resulted in a young man's life being saved last night."