Sometimes even your explosive weapons aren't powerful enough to destroy an obstacle. C-4 is plastic explosive device that can be used on certain doors, walls or equipment to blow them up. This piece of equipment aren't useful in combat, though still essential for mission progress. It can only be used where a flashing red silhouette is found; press the Use key to plant a brick of C-4, then retreat to a safe distance. After a certain amount of time (5 seconds by default), the C-4 will explode.
