sustained a side collision against the right-hand sidepod of Sato's car, causing heavy damage to both vehicles and littering carbon fibre and titanium debris over a wide area of track. Heidfeld's rear structure and titanium gearbox punctured a hole in Sato's car; his knees struck the steering column breaking it in half. Both drivers were sent into a gravel trap and came to a stop there. A visibly shaken Heidfeld was extricated from his car by track marshals with a heavily bruised left leg. After Sato's car absorbed enough energy in the accident, he remained in it with soft-tissue damage to his right thigh, but did not lose consciousness; a section of the Sauber's rear crash structure penetrated the side of the Jordan's monocoque just below Sato's right knee and his helmet was squeezed between the car's head restraint, both of which stopped him leaving his car. The Fédération Internationale de l'Automobile (FIA, Formula One's governing body) safety and medical delegate Sid Watkins and his team took ten minutes to remove Sato from the car and treated him at the crash site before transporting him by ambulance to the track's medical centre. From there, Sato and Heidfeld were flown by helicopter to Graz University Hospital, for overnight observation and precautionary x-ray scans. Under safety car conditions, every team apart from Ferrari and Williams brought their drivers to the pit lane for additional fuel and a set of tyres. After 20 minutes, the race restarted at lap 36's end when the safety car entered the pit lane. Barrichello led Ralf Schumacher, Michael Schumacher, Montoya, Coulthard and Fisichella. On lap 37, Webber passed his teammate Yoong for 13th. Villeneuve passed Fisichella for sixth place at the start of the 38th lap. On the same lap, Irvine entered the pit lane to retire with hydraulics failure. Two laps later, Villeneuve caught and overtook Coulthard at turn one for fifth. Coulthard lost sixth place to Fisichella after driving on oil and off the circuit on the 45th lap. On the same lap Trulli pulled over at the end of the pit lane wall on the main straight to retire from with a loss of fuel pressure. Yoong retired with fire visible from the rear of his Minardi soon after. Green flag pit stops began on lap 47. Ralf Schumacher made a pit stop and dropped to fifth position. His teammate Montoya remained on the