Sector 3

Sector 3 is the third containment sector in the game. To access it, you need to first open the large gate that only opens if two of the card readers are activated and a button is pressed, which leads to another door that leads to the Comically long Hallway, which leads to the final door to the sector 3. To keep the facility safe, it's recommended to close the large gate behind the personnel after they enter the area, and station a few mobile task forces in the giant ramp leading down into the area. It makes it much easier for the mobile task forces to defend the facility as they can just jump on the "handrails" and recontain the scps from there.

Sector 3 contains the most scps in the game, including: SCP-173, SCP-049, SCP-966, SCP-409, and SCP-457, all of whom are hostile except SCP-409, which is the contagious crystal. If the scps ever got out of the containment of sector 3, then the gate will be able to keep the facility safe if it was closed. If not, a lot of people are going to die in the process of recontainment.