The stuff I've read seems to indicate that they were doing ~160 km/h. If they were doing 200 the 'experts' (dunno whether they are or just media informants) reckon the damage would have been even worse. The thing is though, not even a roll cage, 6-point harness, helmet, neck brace, etc. or any of the other safety features in a V8 supercar or any race car would have saved them. They hit a tree which has maybe 5mm of crumple zone at 160 km/h. The G-forces involved are not survivable. It's one reason why street races have concrete blocks around trees. Their wider surface area is much better at deflecting the car (hence absorbing some of the energy as it richochettes off) rather than stopping it like a thin tree trunk does. At 160 km/h, they would have been doing 44.4 m/s so by the time they even saw the tree or the corner, it was probably too late. One of my mates father is a paramedic and he's seen some gruesome stuff. When you hit things (particuarly solid objects like trees or bridge pylons) at high speed, all sorts of weird things happen. He told one story of a guy who hit a tree head-on at an estimated speed of about 125 km/h. The autopsy revealed that his heart had been partly squeezed through his ribcage (along with his lungs), soft tissues in the eyes had disconnected, etc. It's also quite common for people to suffer hyper extended limbs or even have the limb part the rest of the body.