The door is thrown open with such force that it is now hanging from only one hinge.
As you struggle to regain the breath that was knocked out of you by the blast, you stare wildly into the blackness where the door used to be. The emergeny lighting doesn't reach that far, but all the same, you catch glimpses of movement outside, and hear the sound of slow, steady breathing.
The sound sends a chill down your spine.
You glance at the monitors. All are black. Someone might notice that the power has gone, but it seems unlikely. You're on your own.