Longest survival without food and water

The longest recorded case of survival without food and water is 18 days by Andreas Mihavecz (Austria), then aged 18. He was put into a holding cell on 1 April 1979 in a local government building in Höchst, Austria, but totally forgotten by the police. On 18 April 1979, he was discovered close to death. Mihavecz had been a passenger in a crashed car.