The Alpha Warhead is a Mechanic in SCP: Secret Laboratory that causes the underground section of Site-02 to be blown up, forcing everyone to evacuate to the Surface.
The Alpha Warhead acts as a last resort emergency method in an event of a serious containment breach, with the intent of blowing up any threat that is inside Site-02.
The Alpha Warhead is a mechanic often used to stop campers from prolonging the round by forcing them out of hiding.
To turn on the Alpha Warhead, one most locate the silo in Heavy Containment Zone and flip its lever into the "Ready" position. This can be done by anyone except SCP-079.
Afterwards, one must go up to the Surface Zone and open the Warhead Activation Room, which requires a Keycard with to open.
There is then a button that is locked underneath a glass panel, which also requires Nuke Access to open. Afterwards, the button can be pressed by anyone if the Alpha Warhead is enabled.
The screen on the terminal will state the current status of the Alpha Warhead. "Ready" means you can turn the Alpha Warhead on. "Disabled" means you can't turn the Alpha Warhead on. "Please Wait" means that you must wait before turning the Alpha Warhead back on.
If the warhead is enabled, and the button is pressed, a countdown will begin on the screen in the Nuke Room. A loud alarm will also play twice as soon as the detonation sequence has begun.
C.A.S.S.I.E. will then announce the activation and how much time until the Alpha Warhead blow ups.
The time can range from 80 seconds to 120 seconds, depending on the server, though the default time is 90 seconds. A siren will also begin to play while the Alpha Warhead goes off. Red lights will turn on through out the entire facility, including on Surface Zone.
Most doors inside the facility will be locked in an open state during the nuke. However, SCP-106's CC Door and SCP-079's CC Door will stay closed.
Servers can use also configs to make it possible for Gate A and B to be closed during the detonation sequence; this can be useful for trapping SCPs inside Site-02.
During the last 45 seconds of the timer until detonation, a snippet of "Ajoura - The SCP Foundation Main Theme" will begin to play.
When the Alpha Warhead blows up, anything left inside the facility will be instant killed. This include SCP-079, regardless of where its camera currently is (making it of the three ways to kill SCP-079). The door to the Nuke Room on Surface Zone will also open by itself and can no longer be closed, stopping people from camping the room post Alpha Warhead.
The detonation sequence can be canceled by pressing the red button in the Alpha Warhead Silo on the control panel. When this happens, the sirens will stop, the lights go back to normal and C.A.S.S.I.E. will announce the warhead has been cancelled. The level can also be flipped back to the off state to stop people from turning the Alpha Warhead back on, forcing people to go back to the Nuke Silo to flip it back on.
If the detonation sequence is started again after being cancelled, C.A.S.S.I.E. will announce that the sequence has been resumed, and will say how much time is remaining. The time remaining is based off how much time was left when the Alpha Warhead was last canceled.
It is impossible to turn off the Alpha Warhead at the last 10 seconds of the countdown; the screens in both the Silo and Surface nuke room flash "Detonation Inevitable" above and below the countdown.
One of the following lines will play when the nuke is turned on for the first time in a round.
One of the following lines will play when the nuke is reactivated after being cancelled.
- The Overcharge event will not occur during the detonation sequence.
- Any SCPs terminated by the Alpha Warhead will not give MTF Respawn Tickets.