Methods for modifying a crash deceleration pulse

A volume-filling mechanical structure for modifying a crash comprising a honeycomb celled material (104) expandable from a dormant state to a deployed state; a support surface (105) cooperatively positioned with the honeycomb celled material (104) to cover a surface of the honeycomb celled material in the deployed and dormant states; and a means (100) for deploying said volume-filling mechanical structure from said dormant state to said deployed state.