Special Containment Procedures: Containment Area 25b is to be located 200 m below sea level, tunneled out of solid bedrock in a seismologically stable area. Sole access to the containment facility is to be through a vertical elevator shaft separated every fifty (50) meters with a reinforced blast door, constructed of 20 cm thick material shielding. Elevator shaft shall be flooded with seawater when not in use.

Containment Area 25b is to be constructed with the following components:

An Outer Security Perimeter against outside threats, staffed by security personnel trained in close quarters battle and counter-intrusion tactics.
An Administrative and Support Area (ASA) consisting of support facilities and living quarters for on-site personnel.
A Primary Containment Zone (PCZ), consisting of a 7 m cube encased in 1.5 m of reinforced material. PCZ is to be designed to be flooded and drained as needed, and should remain filled with seawater unless access to contents is required.
A 150 m "killing corridor" which is to be the sole access to the PCZ from the ASA (including water, power, drainage, and ventilation lines). The walls and floor of the corridor are to be reinforced in a similar manner to the PCZ, with the addition of an electric deterrence system capable of delivering a 20,000 volt shock.

Info from SCP Foundation: [ Ссылка ]

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