
Returning to the lab, you see a hallway blocked with debris that you climb into ( Research Control). In a side room are storage lockers #216 containing cells, shells and an ammo belt, and #217 containing armor, a BFG charge and grenades (keycode 624). Jump through the opening ( Specimen Research Lab). Near the end, you find shards to your right, and to the left is an opening. Crawl into the nearby vent ( Ventilation Duct). Moving along the corridor, you arrive at a balcony ( Upper Office Corridor). Get on the nearby lift, and ride it up.
Go through the door ( Supply Lift Access), to be attacked by a z-sector. Approaching it unlocks it, and a commando zombie flies out. In the corridor is a locked security door. At the end of the corridor are shards, and an aide kit Exit the kitchen into the corridor ( Research Lab Corridor). There is a medkit and adrenaline in the kitchen. The hallway ( Common Area Access) continues at the other end of the room. There is armor on a console, and a medkit, and clip behind the equipment bay. Go through the door ( Central Processing), to encounter commando zombies, an imp and a zombie. Continue along the hall to the Central Access security door. Storage locker #103 (keycode 259), contains cells, shells and a medkit. On the console is a PDA (Francis Erikson).
In the hall are steps alongside an equipment bay. Move along the corridor, and when you hear Betruger laugh, a commando zombie, a fat zombie and an imp attack.
Exit, then go through the door labeled 4 ( Maintenance Corridor). There is armor at one end of the alcove, and rockets at the other. Go through Storage 2 ( Service Area), where a zombie assaults. On a console in the offices, there is a Supply Storage Area panel displaying a UNLOCK STORAGE DOOR button to press, unlocking the Storage 2 door. Go up the stairs, then into the office area to the left of door “4”. Return to the locked Biological Research Div door which opens with your card ( Data Control Terminal). Exit the room, to be attacked by imps. The access card for that locked door is on a chair, and taking it triggers a zombie. Go through a door ( Teleport Observation). Follow the hall ( Observation Access), and a flaming zombie assaults. Exit ( Teleporter Chamber), and through the door ( Research Access).