Doom 3 Walkthrough Alpha Labs Sector 1

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.

Alpha Labs Sector 1

Doom 3 Walkthrough - Doom 3 203
Doom 3 Walkthrough - Doom 3 203

Sarge urges you to move faster. Use the panel on the right to open the transfer doors. This zombie wakes up and comes after you. A clip and a medkit are to the left.

Doom 3 Walkthrough - Doom 3 204
Doom 3 Walkthrough - Doom 3 204

Three more come after you from the right.

Doom 3 Walkthrough - Doom 3 205
Doom 3 Walkthrough - Doom 3 205

Armor and a health station are found along the right wall.

Doom 3 Walkthrough - Doom 3 206
Doom 3 Walkthrough - Doom 3 206

This terminal, previously red, unlocks the doors on the right.

Doom 3 Walkthrough - Doom 3 207
Doom 3 Walkthrough - Doom 3 207

Battle three Z-Sectors in the next room. Armor and ammo can be found in the right corner.

Doom 3 Walkthrough - Doom 3 208
Doom 3 Walkthrough - Doom 3 208

Advance down the corridor and be met by this zombie.

Doom 3 Walkthrough - Doom 3 209
Doom 3 Walkthrough - Doom 3 209

Defeat the zombie and this Imp spawns behind you.

Doom 3 Walkthrough - Doom 3 210
Doom 3 Walkthrough - Doom 3 210

Mother! Ready your shotgun before opening this door -- an Imp is ready to pop out! Two Z-Sectors follow.

Doom 3 Walkthrough - Doom 3 211
Doom 3 Walkthrough - Doom 3 211

Watch this UAC video to learn about the Elemental Phase Deconstructor. Hop through the broken window.

Doom 3 Walkthrough - Doom 3 212
Doom 3 Walkthrough - Doom 3 212

Two Imps spawn. Defeat them and grab a medkit and shells beneath these stairs. A third Imp spawns after you retrieve the medkit.

Doom 3 Walkthrough - Doom 3 213
Doom 3 Walkthrough - Doom 3 213

Ready your shotgun before entering that room on the left.

Doom 3 Walkthrough - Doom 3 214
Doom 3 Walkthrough - Doom 3 214

This zombie and Z-Sector are waiting inside.

Doom 3 Walkthrough - Doom 3 215
Doom 3 Walkthrough - Doom 3 215

Approach this opposite door and everything goes red again -- I think these are failed attempts by the hellforces to turn you into a zombie.

Doom 3 Walkthrough - Doom 3 216
Doom 3 Walkthrough - Doom 3 216

This Imp spawns at the other door. Here he is taking a big chunk out of me.

Doom 3 Walkthrough - Doom 3 217
Doom 3 Walkthrough - Doom 3 217

Over here you'll find the EPD video and Kyle Berger's PDA, revealing the storage locker code 752.

Doom 3 Walkthrough - Doom 3 218
Doom 3 Walkthrough - Doom 3 218

Heal at this health station.

Doom 3 Walkthrough - Doom 3 219
Doom 3 Walkthrough - Doom 3 219

Use the code 752 to unlock this locker in the hallway. Inside are armor, two medkits, grenades and a clip.

Doom 3 Walkthrough - Doom 3 220
Doom 3 Walkthrough - Doom 3 220

Approach the door that caused the room to turn red earlier and defeat this Imp.

Doom 3 Walkthrough - Doom 3 221
Doom 3 Walkthrough - Doom 3 221

A voice to your right beckons, "Follow me." Do so and you'll find this armor.

Doom 3 Walkthrough - Doom 3 222
Doom 3 Walkthrough - Doom 3 222

To the left is this "Chamber Repair Access Panel." Ready your machine gun before activating it -- a Z-Sector will spawn at the window beyond.

Doom 3 Walkthrough - Doom 3 223
Doom 3 Walkthrough - Doom 3 223

Duck and cover. Enter the chamber - crouched.

Doom 3 Walkthrough - Doom 3 224
Doom 3 Walkthrough - Doom 3 224

An ethereal voice says, "Help me." When the beam is not firing, stand up and press the red pad above the access panel.

Doom 3 Walkthrough - Doom 3 225
Doom 3 Walkthrough - Doom 3 225

Crawl into the conduit and take out this Z-Sector, plus a zombie to the left.

Doom 3 Walkthrough - Doom 3 226
Doom 3 Walkthrough - Doom 3 226

Defeat this second zombie. Grab armor from the right and continue through that door on the left.

Doom 3 Walkthrough - Doom 3 227
Doom 3 Walkthrough - Doom 3 227

After passing through the door, you'll find a medkit to the left. In this corridor to the right you'll find this Imp. Toss a grenade his way.

Doom 3 Walkthrough - Doom 3 228
Doom 3 Walkthrough - Doom 3 228

It's awfully dark in here. Your pistol will take out these two but you'll be firing blind. You might prefer the shotgun.

Doom 3 Walkthrough - Doom 3 229
Doom 3 Walkthrough - Doom 3 229

Repeat on this fat zombie to the right. A medkit can be found behind that crate on the left.

Doom 3 Walkthrough - Doom 3 230
Doom 3 Walkthrough - Doom 3 230

Grab the grenades and shells through this door on the opposite side of the room.

Doom 3 Walkthrough - Doom 3 231
Doom 3 Walkthrough - Doom 3 231

Continue past where the fat zombie was and defeat three more zombies in these corridors.

Doom 3 Walkthrough - Doom 3 232
Doom 3 Walkthrough - Doom 3 232

This is one of the creepiest areas of the game -- and that's saying something. The banging sound effect plus the darkness plus the many zombies are almost too much. Explore to find this headless zombie on the left, guarding some shotgun shells.

Doom 3 Walkthrough - Doom 3 233
Doom 3 Walkthrough - Doom 3 233

Yikes. If this doesn't make you jump, you aren't alive. He's to the right of the previous zombie and doesn't have any goodies in his alcove.

Doom 3 Walkthrough - Doom 3 234
Doom 3 Walkthrough - Doom 3 234

Up some stairs is another zombie, the PDA of Jack Smith, a medkit and a clip. Use the terminal on the left to extinguish a pipe leak fire.

Doom 3 Walkthrough - Doom 3 235
Doom 3 Walkthrough - Doom 3 235

Return to this door to find it now passable.

Doom 3 Walkthrough - Doom 3 236
Doom 3 Walkthrough - Doom 3 236

A Z-Sector and this Imp attack. Toss a grenade or two their way. A medkit, shells and clips are in the room to the left.

Doom 3 Walkthrough - Doom 3 237
Doom 3 Walkthrough - Doom 3 237

Ready your machine gun then pass through this door. A medkit and armor are visible ahead.

Doom 3 Walkthrough - Doom 3 238
Doom 3 Walkthrough - Doom 3 238

This disturbing cutscene follows -- that's just not right.

Doom 3 Walkthrough - Doom 3 239
Doom 3 Walkthrough - Doom 3 239

The cutscene also shows a new enemy, the maggot.

Doom 3 Walkthrough - Doom 3 240
Doom 3 Walkthrough - Doom 3 240

The maggot's glowing eyes and dual heads are extremely creepy. They aren't that hard to take out individually, but they attack in groups and you do not want to get pinned against a wall.

Doom 3 Walkthrough - Doom 3 241
Doom 3 Walkthrough - Doom 3 241

Drop into this crawlspace.

Doom 3 Walkthrough - Doom 3 242
Doom 3 Walkthrough - Doom 3 242

This Imp swiftly crawls away.

Doom 3 Walkthrough - Doom 3 243
Doom 3 Walkthrough - Doom 3 243

There are two exits from the crawlspace. Take the one on the right first. You'll find a medkit and armor. Return here and exit to the left. Grab shotgun shells just before exiting.

Doom 3 Walkthrough - Doom 3 244
Doom 3 Walkthrough - Doom 3 244

You'll be met by these two zombies. Armor and a medkit are behind the zombie on the right.

Doom 3 Walkthrough - Doom 3 245
Doom 3 Walkthrough - Doom 3 245

Down a corridor to the left is this door. Shoot the explosive barrels to incinerate the patrolling Z-Sector. Continue right and defeat another Z-Sector.

Doom 3 Walkthrough - Doom 3 246
Doom 3 Walkthrough - Doom 3 246

Up some stairs you'll be met by this maggot and Z-Sector. Pick up a medkit left of the crate. Continue through the door ahead.

Doom 3 Walkthrough - Doom 3 247
Doom 3 Walkthrough - Doom 3 247

Up some more stairs and you'll find this armor. Approach and a secret panel opens, releasing this Imp. Another spawns behind you. Additional armor can be seen to the right of the Imp. Continue through a door to the left.

Doom 3 Walkthrough - Doom 3 248
Doom 3 Walkthrough - Doom 3 248

Everything turns red once again. Ready your shotgun. An Imp spawns ahead of you and behind you. Advance through the opposite door and take out a zombie to the left.

Doom 3 Walkthrough - Doom 3 249
Doom 3 Walkthrough - Doom 3 249

Grab the Hydrocon video disk. The door on the right is locked - for now. Continue through the door on the left, ready for combat.

Doom 3 Walkthrough - Doom 3 250
Doom 3 Walkthrough - Doom 3 250

A zombie and this maggot are waiting for you inside, plus an Imp comes charging through the opposite door. A medkit is on the counter.

Doom 3 Walkthrough - Doom 3 251
Doom 3 Walkthrough - Doom 3 251

Climb this ladder.

Doom 3 Walkthrough - Doom 3 252
Doom 3 Walkthrough - Doom 3 252

Follow the tight corridor and listen to Kreitman. Slip through the rapidly raising/lowering "door" on the left.

Doom 3 Walkthrough - Doom 3 253
Doom 3 Walkthrough - Doom 3 253

Grab Bernie Lipsitz's PDA, plus two medkits and armor in the far corner. Drop through the floor opening seen here.

Doom 3 Walkthrough - Doom 3 254
Doom 3 Walkthrough - Doom 3 254

You're back in this room, but Bernie Lipsitz's PDA has given you clearance to open the door.

Doom 3 Walkthrough - Doom 3 255
Doom 3 Walkthrough - Doom 3 255

Proceed through this door, defeating a zombie and this Z-Sector.

Doom 3 Walkthrough - Doom 3 256
Doom 3 Walkthrough - Doom 3 256

Three maggots attack in this next area. A fourth is in the room ahead. You machine gun can handle them all with relative ease.

Doom 3 Walkthrough - Doom 3 257
Doom 3 Walkthrough - Doom 3 257

Grenades, armor and this health station are in the next room. Continue through that door and through another door to the right.

Doom 3 Walkthrough - Doom 3 258
Doom 3 Walkthrough - Doom 3 258

The Hydrocon video plays in this room. Advance to the room beyond and this maggot attacks. Two Z-Sectors come up behind you. Reload your machine gun and save your game before advancing.

Doom 3 Walkthrough - Doom 3 259
Doom 3 Walkthrough - Doom 3 259

When you get to this room, rush to that railing up ahead and jump on as quickly as you can -- a swarm of maggots is about to attack!

Doom 3 Walkthrough - Doom 3 260
Doom 3 Walkthrough - Doom 3 260

From high on this vantage point you are free to reign destruction below. You'll almost feel sorry for the maggots.

Doom 3 Walkthrough - Doom 3 261
Doom 3 Walkthrough - Doom 3 261

Call the elevator behind you. Activate this panel to move on to Alpha Labs Sector 2.

More Doom 3 Walkthroughs

This Doom 3 walkthrough is divided into 27 total pages.

More From Port Forward

Thumbnail for Phantasy Star Online 2: New Genesis

How to Port Forward in Your Router for Phantasy Star Online 2: New Genesis

Help improve your connects in Phantasy Star Online 2: New Genesis by forwarding some ports in your router.

Read More
Thumbnail for Darkest Dungeon

Forward Ports on Your Router for Darkest Dungeon

You can help improve your online multiplayer connections in Darkest Dungeon by forwarding some ports in your router.

Read More
Thumbnail for For Honor

For Honor Port Forwarding

Help improve your online connections and make connecting with others easier in For Honor by forwarding some ports.

Read More
Thumbnail for Chicory: A Colorful Tale

Forwarding Ports for Chicory: A Colorful Tale on Your Router.

You can forward some ports in your router to help improve online connections for Chicory: A Colorful Tale.

Read More
Thumbnail for Wave Break

Create a Port Forward for Wave Break in your Router

Forwarding some ports for Wave Break can make it easier to play with others and help improve your connections.

Read More
Thumbnail for Knockout City

Forwarding Ports for Knockout City on Your Router.

Help improve your online connections in Knockout City and connect with more players by forwarding some ports.

Read More
Thumbnail for Dying Light 2: Stay Human

Port Forwarding for Dying Light 2: Stay Human

You can connect with friends more easily and help improve connections in Dying Light 2: Stay Human by forwarding some ports.

Read More
Thumbnail for Far Cry 6

Creating a Port Forward in Your Router for Far Cry 6

You can help improve your online experiences and more easily connect with others in Far Cry 6 by forwarding some ports.

Read More