In contrast to a steel body where bending helps the integrated crumple zones to reduce the amount of crash energy that reaches the vehicle's occupants, carbon fibre dissipates energy by cracking and shattering. Close attention was given to the way the carbon fibre body reacted to the extreme forces involved in the impact. The engineers also focused on how the underlying steel body structure, and carbon fibre 'dragonfly' which strengthens it, managed the forces.