 When the mine experiences sudden overpressure an air bladder inflates caused by the differential in pressure between the upper and lower sections, this prevents the activation of the mine.When constant pressure is applied the pressure equalizes gradually and the mine is activated, a firing pin is flipped sideways by the plunger into a stab-detonator, which fires the horseshoe-shaped main explosive charge.The amount of explosive in a VS-Mk 2 mine is comparatively small in relation to other anti-personnel mines because it is designed to disable victims, not kill them.