Vaultguy
Unlocks Possessed Engineer Model
After collecting the Yellow Keycard, turn around and hop over the left railing onto a metal platform. Search under the walkway to find the first Collectible, Vaultguy.
Prototypeguy
Unlocks Plasma Rifle Model
Before you take care of the Gore Nest in the room past the conveyer belt, search inside the middle of three boxes on the belt. Inside is the second Collectible, Prototypeguy.
