Lily dives underwater, intending to stay submerged for four minutes. As she reaches the end of her breath, she prepares to resurface. However, an unseen power holds her down, preventing her from surfacing. Panic sets in as Lily struggles against this mysterious power, desperately trying to break free and reach the air above. Each attempt to break the surface becomes more frantic as she fights for survival against the relentless power keeping her submerged.