As pointed out by Scott in the comments earlier, RTL have released a 3D animation detailing Heikki's crash at the Spanish Grand Prix.

The video shows the front left rim exploding, the tyre deflating and then the front suspension giving up altogether, before the car careers headlong into the tyre barrier.

RTL also created a similar sequence for Kubica's crash in Montreal, so they're getting pretty good at these. I don't know if they have access to any specific crash data although it seems likely, but assuming this animation is accurate then that barrier deformation is somewhat frightening.