It is your duty to monitor the surveillance cameras at several locations.
So called anomalies have been spotted, making objects change in numerous ways, or even completely being removed from the scene.

You have to pay very close attention to see if anything has changed during your surveillance shift. If so, report the anomaly and try to complete your 15-minute shift.
If 4 anomalies are active simultaneously, the system will malfunction and you have to start over.

Good luck and stay sharp!