All the armchair experts claimed the Cybertruck has no crumple zone and I get it, the proportions seem impossible. It was a tough one and there is a lot of engineering that went into it. Let me break it down for you:

Here you can see the large single piece casting in action in a high energy crash. The plot is showing the Impulse (Y-Axis) over time (X-Axis) and we see a nice linear progression with no large spikes.

The bumper beam is crushed in the first few milliseconds and the vehicle senses and determines what type of crash is happening and how to best deploy the restraints (air bags and seat belt pretensioners).

As the crush continues, bending the steel of the drive unit cradle to move the drive unit down and out of the way. This enables the casting to progressively crush cell by cell, with a nearly linear crush energy, slowing down the vehicle smoothly and over a longer period of time which reduces the acceleration transferred to the occupants. During this time and in concert with the structural absorption, the restraints are deployed which further reduce the acceleration of the occupants, reducing probability of injury.

Amazingly you can see the accuracy of the virtual analysis compared side by side to an actual physical test. Getting these modeling details accurate expedites design iteration for all the various different crash cases to converge on the optimal geometry.