A blast mitigation method includes forming a body of solid material which transitions from a solid state to a non-flowing viscous fluid state when stressed which attaching it to the body of the undercarriage of a vehicle. The material of the body transitions from a solid state to a viscous fluid, state when an explosion occurs, is proximate the body and it absorbs at least some energy from the explosion mitigating impact on the vehicle. A plunger plate with blades extending outwardly therefrom is coupled to the body and oriented such that the blades are adjacent the body.