Delta Labs - Level 4: Union Aerospace Research Division

DELTA LABS - SECTOR 4 - "Delta Labs - Sector 4 houses the third generation transfer portal. All teleporter destination research is classified. Only top level personnel have access to the central control and activation grid for the primary test chamber."

Delta Labs - Level 4: Union Aerospace Research Division is the nineteenth level of Doom 3. This is a very short level, consisting of a few corridors that eventually leads to the room where the main teleporter is located. This area suffered the most damage from the invasion as it all began here. The player will notice the corridors are completely drenched in blood, with messages such as "SUCCUMB", "DIE", "SUFFER", and "FEAR" written on the walls, and skeletons and human remains scattered around. The player will be briefly greeted by a pair of Chainsaw Zombies (infamously, one of them is wearing a party hat) before engaging a pair of Hell Knights for the first time. Betruger will send the player to Hell via the main teleporter.

AREAS IN DELTA LABS LEVEL 4:
 * Air Lock
 * Delta 4 Junction 1
 * Delta 4 Junction 2
 * Delta 4 Security Check-In
 * Delta 4 Main Ready Room
 * Delta 4 Security
 * Delta 4 Transference Lab 001

Walkthrough
Betruger will greet the player that they will never find the Soul Cube. All the player needs to do is go through the blood drenched halls, where two Chainsaw Zombies will lurk around. Once arriving at the end of the hall, there will be a doorway on the right. Don't enter there yet, as it leads to the main teleporter. Instead, turn to your left to find another doorway in the corner. You will enter a small office containing a locker and a health station. The locker code is found at a nearby computer next to where a skeleton is sitting down. After obtaining health and the supplies from the locker, exit the office and you can proceed to the main teleporter room. Once arriving, the cutscene will play of Betruger trapping you in and activating the teleporter, spawning two Hell Knights in the process.

Space for fighting the beasts is limited, and having to fight two adds an extra challenge. The BFG9000 can come in handy here, as one or two fully charged shots will obliterate both of them. If the BFG is not available, the Rocket Launcher, Chain Gun, and the Plasma Gun are also good options. Be very cautious not to get caught in the splash damage from the Rocket Launcher. The best strategy in this scenario is to try to take your time efficiently to take out one Hell Knight before moving to the other one. Also, do not end up getting cornered or surrounded by the monsters in the process. It is a lot better to immediately have one Hell Knight killed quickly once the fight starts.

After the battle, Betruger will re-activate the teleporter, sending you directly to Hell.

PDAs

 * Jack Gilbert

Characters

 * Malcolm Betruger

Enemies

 * Former Humans
 * Chainsaw Zombies
 * Demons
 * Hell Knights

Weapons/Items

 * Chainsaws
 * Ammo Belts
 * Rockets
 * Security Armor

Cabinet Codes

 * Storage Cabinet #104: Security - 579

Trivia

 * The two Hell Knights that the player battles are inspired by the infamous "Bruiser Brothers," a pair of Barons of Hell who acted as a boss in the episode "Knee-Deep in the Dead" of the original Doom.
 * In the BFG Edition, due to how short this level is, it is advisable to try to obtain the "Not a Scratch" trophy/achievement.
 * Also in the BFG edition, the player can find the words "You laugh, it works" written in blood in the Main Ready Room before they fight the Hell Knights. Finding this blood stained words will grant the trophy/achievement with the same title.
 * The ending cutscene briefly shows a montage of this level, as Recon Zulu provides the visual status on how much damage the entire Martian base has sustained.