Examination, the base takes place at the RSU Labs in Menlo, a nation infested by the "WE-30" outbreak. You play as a member of a relief wave sent to clear a highly irradiated nuclear silo and laboratory, starting your mission in Sector 1.

The sterile air of the WE30 nuclear facility—turned-laboratory—buzzes with static as a ragtag Tactical Operations Center (TOC) team pushes into the deep subterranean lab. Their desperate mission: navigate the radioactive ruins and stop the mutated, lethal infected.The heavy steel door to Sector 2 groaned open, echoing through the claustrophobic utility tunnels."Keep your flashlights low and weapons ready," squad leader Bill whispered, his radio crackling with white noise. "We’re in hot territory. Command says Rasonian hostile units have been sighted in the deeper corridors."Bill’s team—a Medic, a Breacher, and a Scout—moved in a tight formation through the darkened corridors, their breathing heavy behind gas masks. The walls were scarred with eerie tally marks and emergency red lights that cast long, unsettling shadows.As they approached the Sector 2 logistics area, the squad suddenly heard the heavy, rhythmic click of a shotgun reloading."Take cover!" the Medic shouted, diving behind a metal crate.Stepping out of the darkness was Sinitzyn Komarek, a hulking, hostile person armed with an R8 shotgun. His eyes glowed a menacing yellow in the dark, and with a sudden burst of terrifying speed, he sprinted directly toward the team. The Breacher fired a barrage of suppressive bullets, forcing the shotgun-wielding attacker into a tactical retreat, giving the squad just enough time to slip into the backup generator room.Reaching the relative safety of the Control Room, the team scrambled to boot up the facility's offline computers. A jagged, monstrous roar echoed from the elevator shaft below them. The monitor flickered to life, flashing a warning: THEY BREACHED. REACTOR 4 CONTAINMENT FAILURE.The emergency klaxons began to scream. Ripping his rifle up, Bill looked at his squad. "They're coming through the vents. Hold the line!" They left you behind by accident while you looked for a way to shoot the person