The sound effect is immediately followed by the rhythmic, intensifying "beep" of the C4. This auditory layering is designed to increase the player's heart rate as the detonation time (40 seconds) approaches. Tactical Significance
The classic radio commands in Counter-Strike were originally voiced by Jeff Cliffe , one of the co-creators of the original mod. bomb_has_been_planted_sound_effect_csgo
High-volume versions of the sound are frequently used in "MLG" style montages or jump-scare videos. The sound effect is immediately followed by the