Level 3 Artifact 3: The Inflatable Chicken
An inflatable chicken, because who wouldn't want that in their bunker?
Warning: do not attempt to use as a makeshift flotation device, as the rubber is prone to popping and will result in a most unbecoming splatter.
Located 5 meters east of the "Important Person's" office, behind a false wall with a cryptic message that says "Not a thing, I swear."