Doom 3 Walkthrough Delta Labs Sector 3

September 12, 2016 (Last Updated: ) | Reading Time: 8 minutes

This Doom 3 walkthrough is divided into 27 total pages.

You can jump to nearby pages of the game using the links above.

Delta Labs Sector 3

Doom 3 Walkthrough - Doom 3 913
Doom 3 Walkthrough - Doom 3 913

Exit the lift then look through this window on the left to spy Betruger and his demons below. Three Z-Sectors and a commando are through the first door. Cells, armor and a machine gun can be found to the left of this Z-Sector.

Doom 3 Walkthrough - Doom 3 914
Doom 3 Walkthrough - Doom 3 914

The Chamber 1 access door on the left is locked for the moment. Enter the security station on the right.

Doom 3 Walkthrough - Doom 3 915
Doom 3 Walkthrough - Doom 3 915

Heal at the health station on the right. Ready your shotgun before unlocking the outside door with the red terminal far-left, as a whip commando will charge in.

Doom 3 Walkthrough - Doom 3 916
Doom 3 Walkthrough - Doom 3 916

Continue through the now-unlocked Chamber 1 access door then enter the restroom on the right. Note the armor at the foot of the door.

Doom 3 Walkthrough - Doom 3 917
Doom 3 Walkthrough - Doom 3 917

A Z-Sector is inside, and after defeating him a whip commando will charge in. This corner stall has armor, shells and a clip.

Doom 3 Walkthrough - Doom 3 918
Doom 3 Walkthrough - Doom 3 918

This Imp greets you upon exiting the restroom.

Doom 3 Walkthrough - Doom 3 919
Doom 3 Walkthrough - Doom 3 919

Upon entering the door ahead, an Imp spawns and a Z-Sector charges. Retreat to this position and pummel them with the rocket launcher.

Doom 3 Walkthrough - Doom 3 920
Doom 3 Walkthrough - Doom 3 920

Head right to find another Z-Sector. An Imp spawns in this office.

Doom 3 Walkthrough - Doom 3 921
Doom 3 Walkthrough - Doom 3 921

Frank Cerano's PDA contains the code 841 for cabinet 317. An ammo belt is to the left. A medkit and clips can be found in the office on the right. Continue through the door ahead.

Doom 3 Walkthrough - Doom 3 922
Doom 3 Walkthrough - Doom 3 922

Betruger can be seen on the balcony above, beckoning his minions, "Destroy him!"

Doom 3 Walkthrough - Doom 3 923
Doom 3 Walkthrough - Doom 3 923

Two commandos attack. One jumps over the railing, and the other remains on the balcony above. I found the BFG and rocket launcher to be the best bets for taking out the commando above. Continue through the door ahead.

Doom 3 Walkthrough - Doom 3 924
Doom 3 Walkthrough - Doom 3 924

Han Lee's PDA reveals the code 836 for cabinets 386 and 387. Note the health station on the right.

Doom 3 Walkthrough - Doom 3 925
Doom 3 Walkthrough - Doom 3 925

Also here is this terminal, which unlocks the door to the decontamination chamber.

Doom 3 Walkthrough - Doom 3 926
Doom 3 Walkthrough - Doom 3 926

An Imp spawns, followed by this commando.

Doom 3 Walkthrough - Doom 3 927
Doom 3 Walkthrough - Doom 3 927

Enter the now-unlocked decontamination chamber.

Doom 3 Walkthrough - Doom 3 928
Doom 3 Walkthrough - Doom 3 928

Wait for the decon process to complete then proceed to the next room where this Imp and a commando attack. Continue through the door ahead.

Doom 3 Walkthrough - Doom 3 929
Doom 3 Walkthrough - Doom 3 929

Han Lee's PDA reveals the code 836 for both of these storage lockers. Inside you'll find plenty of supplies. Continue through the door ahead.

Doom 3 Walkthrough - Doom 3 930
Doom 3 Walkthrough - Doom 3 930

A whip commando attacks, plus a chaingun commando entrenched above.

Doom 3 Walkthrough - Doom 3 931
Doom 3 Walkthrough - Doom 3 931

An Imp spawns as you retrieve the shells through this door. An ammo belt is to your immediate left.

Doom 3 Walkthrough - Doom 3 932
Doom 3 Walkthrough - Doom 3 932

The terminal on the left activates the display on the right, where you can choose the teleporter destination. "PAD 1 MAIN" sends you to the other side of the room. Select "PAD 2 BALCONY" then proceed to the teleporter in the center of the room.

Doom 3 Walkthrough - Doom 3 933
Doom 3 Walkthrough - Doom 3 933

Step onto the pad and activate the teleporter.

Doom 3 Walkthrough - Doom 3 934
Doom 3 Walkthrough - Doom 3 934

Ride through the meat grinder.

Doom 3 Walkthrough - Doom 3 935
Doom 3 Walkthrough - Doom 3 935

Pick up the chaingun from the fallen commando then battle this Revenant. Grab the medkit seen far-right then pass through the door to decontamination.

Doom 3 Walkthrough - Doom 3 936
Doom 3 Walkthrough - Doom 3 936

Defeat this chaingun commando then toss a grenade into Storage 03-2 on the right to take out a Z-Sector. Inside the storage area are cells, armor, a health station, plus a spawning Imp. Continue through the door ahead.

Doom 3 Walkthrough - Doom 3 937
Doom 3 Walkthrough - Doom 3 937

A Z-Sector attacks from your right, followed by this Revenant and then a pair of Imps. Continue through the Security Station 2 door ahead.

Doom 3 Walkthrough - Doom 3 938
Doom 3 Walkthrough - Doom 3 938

Shells and clips are on the shelves as you enter. Heal at the health station on the left and grab the adrenaline hypo on the right. Also on the right is a terminal to unlock the teleport 2 access door.

Doom 3 Walkthrough - Doom 3 939
Doom 3 Walkthrough - Doom 3 939

Two commandos attack as you leave.

Doom 3 Walkthrough - Doom 3 940
Doom 3 Walkthrough - Doom 3 940

Make your way to this now-unlocked door.

Doom 3 Walkthrough - Doom 3 941
Doom 3 Walkthrough - Doom 3 941

Defeat the Imp and Z-Sector in the office on the right, where you'll find an armor vest. Continue through the door on the left.

Doom 3 Walkthrough - Doom 3 942
Doom 3 Walkthrough - Doom 3 942

The door locks behind you - no turning back. Two Imps spawn. Defeat them then search the left office for grenades and cells. Continue farther down the hall and three more Imps attack.

Doom 3 Walkthrough - Doom 3 943
Doom 3 Walkthrough - Doom 3 943

Enter the corner office and this chaingun zombie attacks. Note the medkit on the left.

Doom 3 Walkthrough - Doom 3 944
Doom 3 Walkthrough - Doom 3 944

Farther ahead this Imp climbs out of an opening in the floor. Defeat him then climb in.

Doom 3 Walkthrough - Doom 3 945
Doom 3 Walkthrough - Doom 3 945

Keep left and you'll come to this opening.

Doom 3 Walkthrough - Doom 3 946
Doom 3 Walkthrough - Doom 3 946

Use your chainsaw on the whip commando who emerges from the left door. A malfunctioning door control is also to the left.

Doom 3 Walkthrough - Doom 3 947
Doom 3 Walkthrough - Doom 3 947

Inside Storage 03-3 you'll hear a commando but he never appears. Rather, if you shoot the explosive barrels in the corner, this Imp spawns. Inside you'll find a health station, armor, cells, rockets, clips and shells.

Doom 3 Walkthrough - Doom 3 948
Doom 3 Walkthrough - Doom 3 948

Continue down the hall to this position. Doors are left and right. Start with the door on the left.

Doom 3 Walkthrough - Doom 3 949
Doom 3 Walkthrough - Doom 3 949

Defeat an Imp inside then stay close to the door. Two Revenants will enter, the sound of their footsteps giving you plenty of warning to ready your rocket launcher.

Doom 3 Walkthrough - Doom 3 950
Doom 3 Walkthrough - Doom 3 950

Grab the medkit, bullets and armor in this corner.

Doom 3 Walkthrough - Doom 3 951
Doom 3 Walkthrough - Doom 3 951

Backtrack, this time taking the door on the right. Access the terminal on the right to activate this display on the left. PAD 1 MAIN sends you to the room you were just in. PAD 2 HALLWAY and PAD 3 STORAGE place you in close proximity to one another, with PAD 3 giving you slightly better placement. Choose it then step onto the pad and activate the teleporter.

Doom 3 Walkthrough - Doom 3 952
Doom 3 Walkthrough - Doom 3 952

You arrive in this storage room where you'll find an ammo belt, cells, armor and clips. Continue through the door ahead.

Doom 3 Walkthrough - Doom 3 953
Doom 3 Walkthrough - Doom 3 953

That's PAD 2 on the right. You can just make out the green light of a medkit on the left. Ready your rocket launcher then approach the door ahead.

Doom 3 Walkthrough - Doom 3 954
Doom 3 Walkthrough - Doom 3 954

Lots of bad guys in here, including several commandos, Imps, a Revenant and a Z-Sector. Your best bet is to lure them back to this doorway then hit them with rockets. A chaingun commando is entrenched to the left and will not be pulled.

Doom 3 Walkthrough - Doom 3 955
Doom 3 Walkthrough - Doom 3 955

Left-to-right: Heal at the health station. Defeat an Imp through the next door. Defeat a revenant before the following door.

Doom 3 Walkthrough - Doom 3 956
Doom 3 Walkthrough - Doom 3 956

Another Imp waits through a set of double doors, then this Imp awaits down the stairs on the right. If you descend these stairs two more Imps will spawn behind you.

Doom 3 Walkthrough - Doom 3 957
Doom 3 Walkthrough - Doom 3 957

The door on the right is green yet locked. Proceed through the door on the left.

Doom 3 Walkthrough - Doom 3 958
Doom 3 Walkthrough - Doom 3 958

Descend the ladder and defeat an Imp.

Doom 3 Walkthrough - Doom 3 959
Doom 3 Walkthrough - Doom 3 959

Head up these stairs and go through the door.

Doom 3 Walkthrough - Doom 3 960
Doom 3 Walkthrough - Doom 3 960

Grab the supplies on the left and activate the terminal on the right to unlock another decontamination chamber.

Doom 3 Walkthrough - Doom 3 961
Doom 3 Walkthrough - Doom 3 961

Return down these stairs, battling a Revenant and an Imp along the way. Enter the now-unlocked decontamination chamber.

Doom 3 Walkthrough - Doom 3 962
Doom 3 Walkthrough - Doom 3 962

Betruger enters this teleporter after commanding his demons to stop you. Two commandos attack. A medkit and cells are in the right corner.

Doom 3 Walkthrough - Doom 3 963
Doom 3 Walkthrough - Doom 3 963

Approach the teleporter and a Revenant attacks, followed by these two Imps behind you.

Doom 3 Walkthrough - Doom 3 964
Doom 3 Walkthrough - Doom 3 964

Approach the control station. "PAD 1 EXIT" is the way out. You can leave now, but if you don't mind some backtracking we have some stops to make first. Select, "PAD 2 SECURITY."

Doom 3 Walkthrough - Doom 3 965
Doom 3 Walkthrough - Doom 3 965

You're now in Security Station 3. Grab the cells on the floor and Marten Shultz's PDA from the counter ahead, which has some background and allows you to open the door.

Doom 3 Walkthrough - Doom 3 966
Doom 3 Walkthrough - Doom 3 966

Return to the teleporter control and choose "PAD 3 STORAGE." You'll arrive here -- note the medkit to the right of the pad.

Doom 3 Walkthrough - Doom 3 967
Doom 3 Walkthrough - Doom 3 967

Frank Cerano's PDA has the code 841 for this storage locker.

Doom 3 Walkthrough - Doom 3 968
Doom 3 Walkthrough - Doom 3 968

Head across the hall and backtrack to the teleporter from here.

Doom 3 Walkthrough - Doom 3 969
Doom 3 Walkthrough - Doom 3 969

Select "PAD 1 EXIT." ("PAD 4 HALLWAY" puts you back near Pad 3.) Step into the transfer bay.

Doom 3 Walkthrough - Doom 3 970
Doom 3 Walkthrough - Doom 3 970

Activate the panel to load Delta Labs Sector 4.

More Doom 3 Walkthroughs

This Doom 3 walkthrough is divided into 27 total pages.

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