Decontamination Process

P-B-3 Zone-wide Decontamination (S) is a Mechanic in SCP: Secret Laboratory that locks down Light Containment Zone after a set period, preventing players inside the zone from prolonging the round, while also making the overall playable area of Site-02 smaller.
The process is announced and initiated by C.A.S.S.I.E. as an emergency breach procedure.

In Game

Decontamination Display.

C.A.S.S.I.E. will announce to everyone in Light Containment Zone about a decontamination procedure that is scheduled to occur in 15 minutes. A 15-minute timer will then display at both LCZ checkpoints and both elevator systems located in HCZ.
The timer is actually sped up, and the in-game time to decontamination is 11 minutes and 45 seconds. This is done to apply pressure to the players in LCZ.

Once the timer stops all doors in the zone will close and lock. Once the timer ends, C.A.S.S.I.E. will announce that Light is being decontaminated, before closing and locking all the doors. Corrosive gas will spew from the vents, damaging all players (including the SCPs) at a rate of 10% of their max health per second. Every tick the damage is increased by five units.

Announcements

As the round progresses, C.A.S.S.I.E. will announce the procedure's status to the Zone at the 10, 5, and 1-minute mark. At the 30-second mark, C.A.S.S.I.E. will announce a countdown. At this point, all doors in the zone will open. Elevator doors are not automatically called.
The time left is based on the exact moment the announcement starts playing.

The initial 15 minute announcement (11 minutes and 3 seconds left):

"Attention, all personnel. The Light Containment Zone decontamination process will occur in T-minus 15 minutes. All biological substances must be removed in order to avoid destruction."

The 10 minute warning (7 minutes and 45 seconds left):

"Danger, Light Containment zone overall decontamination in T-minus 10 Minutes."

The 5 minute warning (4 minutes and 27 seconds left):

"Danger, Light Containment zone overall decontamination in T-minus 5 Minutes."

The 1 minute warning (1 minute and 9 seconds left):

"Danger, Light Containment zone overall decontamination in T-minus 1 Minute."

The 30 seconds warning (39 seconds left):

"Danger, Light Containment Zone overall decontamination in T-minus 30 seconds. All checkpoint doors have been permanently opened. Please evacuate immediately. 20. 19. 18. 17. 16. 15. 14. 13. 12. 11. 10 seconds. 9. 8. 7. 6. 5. 4. 3. 2. 1."

After Light Containment Zone Locks Down:

"Light Containment Zone is locked down and ready for decontamination. The removal of organic substances has now begun."

Gallery

• 
  The timer on the LCZ Checkpoint Screens, appears a couple seconds after C.A.S.S.I.E. says "in T-minus 15 minutes".
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  The timer as it appears on the screen above the elevators connecting Light and Heavy Containment Zone.
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  The timer during the last 30 seconds.
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  The checkpoint screens if the server disables the Decontamination Process.