Enemies: 29x Imp, 8x Revenant, 21x Zombies, 11x Marine-Zombies

Navigate Delta Labs Level 3 in Doom 3, facing hordes of Imps, Revenants, Zombies, and Marine-Zombies. Find PDAs and essential supplies to survive.

Leave the lift and open the door to face 2 Marine-Zombies and 1 Commando-Zombie. Enter their area for goodies, then return to the room behind you and use the panel to unlock the larger door. A Commando-Zombie will then rush in.

Enter the door the Commando-Zombie came from. A panel will drop, and you'll see a melted bridge. Enter the door labeled "restroom".

Inside, kill the 2 Marine-Zombies. A Commando-Zombie will then attack. Grab the goodies, return to the previous room, kill the Imp, and enter the other door.

You'll hear Marine-Zombies, but an Imp will be summoned first. After killing them, 2 more Marine-Zombies remain. Descend the stairs, enter the room on the right, and kill the Imp. Search for goodies and grab the PDA.

The PDA contains information about Frank Z. Cerano, Ph.D., Delta Labs Level 3, and audio logs about teleportation costs and a medical assistance request. It also provides the code 841 for storage cabinet #317 in storage room D3-1.

Storage room D3-1 is accessible, but the door is jammed. Enter the only available door to face 2 Commando-Zombies. Kill them, then enter the door straight ahead and grab the PDA.

This PDA belongs to Han M. Lee, Administrative Assistant at Delta Labs Level 3. It includes audio logs about teleported teams and missing BFG guns, and a mail from Delta Security mentioning codes 836 for cabinets 386 and 387 near the first teleport chamber.

Use the panel to open a chamber. Upon leaving, an Imp will be summoned, and a Commando-Zombie will drop down. Kill both, then enter the chamber and wait to proceed.

Kill the Imp that jumps at you and the Commando-Zombie that rushes in. Enter the next door. You can open cabinets with code 836. Proceed to the next room with a large teleporter and kill the 2 Commando-Zombies (one on your floor, one above). Enter the adjacent door to find a shotgun, an Imp, and a tentacle-blocked path. Use the panel to teleport to the other side of the room or the balcony. Go to the balcony, kill the summoned Revenant, enter the door, pass the scan, and enter the next door.

Betruger will comment on his dwindling patience.