Mr Dunn, who is an Aston Martin engineer and not a stuntman, suffered only minor injuries and was able to kick his way out of the car and swim to the surface when the £134,000 Aston Martin DBS when it skidded off the road and plunged into the icy waters at high speed.
The DBS is the car which made a fleeting but record-breaking appearance in the past 007 film, Casino Royale in 2006. The production version made its global debut at the famed Concours d’Elegance at Pebble Beach in California last year.