Stunned police got a frantic call from the bus driver as he called from the Mercedes van screaming that he and his two passengers were drowning.
"A man phoned in panic from his mobile phone. He managed to say that he had driven into a lake and he was sinking fast," said police spokesman Marcin Guzenda in Glubczyce, south west Poland.
"He said he had two passengers but he couldn't open the doors - and then he got cut off."
Police, fire and ambulance services rushed to the lake and found the driver and his passengers perched on the top of the mini-bus's roof.
The trio were taken to hospital after the accident but released after treatment for shock.
"There used to be a road there until last year until the local water company flooded the valley to build a new reservoir lake," said one police source.
"It seems that the GPS hadn't been updated and was still showing a usable road running through where the lake now is. It's a huge lake and it's hard to imagine how you could ignore or not see it, but he certainly managed it.
"The driver had such faith in his sat-nav that he didn't even notice all the traffic signs saying the road had been closed," they added. (Ananova.com)