A venting device for a projectile includes a first part comprising a body containing an explosive charge and a second part comprising an actuating element for triggering the explosive charge, the first and second parts forming an assembly able to confine the explosive charge when they are connected, the venting device comprising: a sealing means configured to render the projectile gastight and fluidtight when the first and second parts are connected; an opening means able to allow the projectile to open, the opening means being able to be triggered when the internal pressure in the projectile is higher than or equal to a given pressure threshold; a pushing means able to enlarge the opening of the projectile once the opening means has been triggered.