You're MTF Alpha-1, One of the most trained units of SCP Foundation, O5 demanded you to guard the Control Room while he's not there, you're alone and are silently guarding the place.

After dead silence.. all of the sudden loud siren sets off

"CODE RED! CHAOS INSURGENCY HAS BREACHED THE FACILITY, ALL COMBATIVES REACH TO GATE-B, GUARDS ESCORT NON-COMBATIVES TO THE NEAREST SHELTER"

You hear chaotic shootings, screams and chaos going in the far corridors, everyone is in terror, the SCP Breach alert sets off by AI.. it's extremely confusing as no one's in Control Room