Keycards

Keycards are a very important part of the game, you need a Level 4 keycard to escape.

(SPOILERS)

Keycard Locations:

Level 1: Near the heavy containment/light containment checkpoint.

Level 2: SCP-173's Containment. Hidden in a corner in the hallway towards Warhead Shelter A.

Level 3: In a hiding place in HCZ Storage.

Level 4: Slipped in the doorway to 012's containment.

Level 5: Currently None

Omni: Currently None

Decoy Omni: In the Vents near 079's containment.