Greek authorities are investigating the deadly incident on Wednesday when a car with three people inside plunged into the water near the main port of the island of Antiparos.
A professional diver retrieved all three bodies. A crane was used to lift the car out of the water.
According to local site parianostypos.gr the victims were a man, his 68-year-old wife and their 49-year-old house maid.
The bodies were transferred to the Forensic Medicine Service of Piraeus for a post-mortem examination. According to preliminary reports the 79-year-old man, who was the driver of the vehicle, may have suffered a heart attack.