You're sitting at your desk drinking coffee, another day in hell... When suddenly, the breach alarm blaired, a Chaos Insurgency sabotage caused all containment to breach, letting it's contents out, the on site security ran down the hall as gunshots sounded, the distinct sound of gushing blood sounded.

The breach started when the lights in SCP 173's containment flickered, causing it to kill most of the people in there. Following that, other SCPs breached.

Within minutes, the hallways fell silent.