Doom Eternal – The Ancient Gods: All Collectibles / Secrets (UAC Atlantica Facility) Guide

Game Guides

The Doom Eternal: The Ancient Gods dlc has arrived and so too has a bunch of new levels, missions and of course collectibles

These collectibles usually consist of Support Runes, Secret Encounters, Book Of The Seraphs and more!

This specific page will cover all of the collectibles that can be found within the UAC Atlantica Facility mission. Of which there is a total of 7 different collectibles that you can find. However, there is a total of 18 if you also include the BGF Ammo locations and Automaps too, which are not required for the overall mission 100% completion but are still nice to have anyway

Remember too, that even if you have almost completed the mission you CAN go back for any missed collectibles. As long as you DON’T actually leave the mission altogether


  • CODEX: 4/4
  • SUPPORT RUNE: 1/1
  • SECRET ENCOUNTERS: 2/2

#1 – BOOK OF THE SERAPHS CODEX (1)

  • This one can be found during the mission objective Get The Seraphim’s Key, head down the ramp from the location shown in the above map, keeping to the right head through the next door
  • From here head left and jump down the stairs.
  • The collectible can be found at the bottom of the stairs

#2 – EXTRA LIFE (1)

  • Staying with the same Get The Seraphim’s Key mission objective, jump up and head on top of the nearby structure (in the above image). Here you will be able to find some health, however most importantly if you look up and to the right you should be able to see a smashable vent
  • Use the nearby orange coloured pipe in order to swing to this vent, then of course smash through it
  • From there just keep following the vent down.
  • The Extra Life can be found inside here

#3 – SECRET AREA (1)

  • Grab the Red Keycard which will unlock the nearby Red Access Door, head through this now unlocked door
  • Head up the nearby stairs on the left and up on to the platform to see yet another Red Access door
  • Heading through that door, you will be in a room full of red laser beams. Continue on to the next area.
  • Head to the area on the right just below you, you will need to use the pipe in order to be able to swing there
  • In the next room continue to the right to meet up with another Red Access door
  • Secret Found!

#4 – BOOK OF THE SERAPHS CODEX (2)

  • By now we should have both the Blue and Red Keycards, we should also be outside (as seen in the above image). Here turn to your left in order to shoot at the switch here that is generating wind and more importantly stopping you from being able to jump to the other side (Turning the switch from Green to Orange)
  • Once you have taken care of the switch, jump to the other side and lets continue
  • Continue up the stairs and once at the top you should see your next codex page

#5 – SECRET ENCOUNTER (1)

  • By now we should have both the Blue and Red Keycards, we should also be outside (as seen in the above image). Here turn to your left in order to shoot at the switch here that is generating wind and more importantly stopping you from being able to jump to the other side (Turning the switch from Green to Orange)
  • Once you have taken care of the switch, jump to the other side and lets continue
  • After reaching the platform across and past the wind switch. Stop and turn around and look down, here you should be able to spot the Secret Encounter
  • Deactivate the wind switch once again as it by now will of most likely turned itself on once again
  • Then run and jump to the secret encounter. Defeat all of the enemies within the set time limit in order to unlock the Industrial Espionage 1/2

#6 – SECRET AREA (2)

  • Head to the area in the above images, then from there use the hanging swings to cross the huge abyss below
  • However, after swinging from the last one MAKE SURE TO DEACTIVATE THE WIND SWITCH (GREEN TO ORANGE)
  • Then as you begin to fall, quickly jump onto the grabbable wall in front of you and climb up
  • Climb up and over the platform and gate to the left, where an enemy may be stood
  • You will find the secret here (Blue Orb head)

#7 – BOOK OF SERAPHS (3)

  • Head to the area in the above images, then head towards the door. However, before actually entering the door, stop
  • Look to the right (if the door is in front of you), here you should be able to see a platform balcony that you should be able to jump to, do so.
  • Follow this balcony around to the next collectible

#8 – BOOK OF SERAPHS (4)

  • Head to the area in the above images, then head through the door
  • Ignore the stairs to the left and remain on the lower level
  • The collectible is just around the corner and past the fuel refill

#9 – AUTOMAP

  • Head to the location in the above images (just by the Slayer Gate), carefully pass through the red laser beams
  • The Automap can be found on the other side of this next room

#10 – SLAYER KEY / GATE

For a guide on the location and how to get the actual Slayer Gate Key, head to my other guide here

A Support Rune will be your reward for completing the Slayer Gate

#11 – SECRET AREA (3)

  • Head to the images above, then drop down to the platform below and into the actual water
  • Collect the air bubble and then turn right to find a vent that you can explore
  • Swim up and through the vent
  • Smash through the vent panel in order to find another Blue Orb

#12 – SECRET ENCOUNTER (2)

  • Head to the area in the above images. From there follow the stairs on the right up (following the quest marker)
  • However, once you reach the top of the stairs, stop. We now want to ignore the door with the quest marker (right door), instead we want to enter the door on the left
  • Follow the next room to the useful Dive Suit
  • Activate the terminal to the left of the Dive Suit
  • Head out of this room now, continue to ignore the quest marker door, instead you will want to head back down the stairs and hop into the actual water. Hence the Dive Suit really
  • Whilst underwater you will now want to look for an open kind of area by the air bubble
  • Smash through the vent at the end of this area
  • Following this vent will lead you to the next Secret Encounter. Industrial Espionage 2/2

#13 – BFG AMMO

  • After dealing with the #12 – Secret Encounter (2) head back through the vent that you came through
  • Swim the the air bubble that you would of passed earlier and turn left at that bubble
  • The BFG Ammo can be found on your first left after this, so swim down a bit from the air bubble and turn left

#14 – SECRET AREA (4)

  • Here we should arrive at a rather lovely electrified floor. Jump over all of the electrical fun, we want to be in the North East section of this room (right of the stairs)
  • Follow the path of darkness into the water
  • Swim to the North East section, look down if you are in need of an air bubble as there should be one here
  • At this air bubble turn left to notice a tunnel (broken pipe whichever). Anyway inside this broken pipe tunnel there should be a Blue Orb

#15 – EXTRA LIFE (2)

  • Here you should be able to see a sea full of flames and some ships that have seen better days, oh well. Moving on..
  • From looking at all of the carnage and destruction, turn around and give the nearby switch a good smack. This will move the cargo container nearby
  • Once the container stops, jump onto the nearby swing and use it to get on top of this cargo container. The container will now move
  • Ride the cargo container, weeee
  • Once it stops run and jump onto the clearly visible climbable wall by the floating bubble
  • Climb up or at least as high as you can get, then turn to the right to find a rather large gap in the wall that you should be able to jump to
  • Follow this next path right, say hello to the Empowered Dread Knight which may now appear
  • Beyond him though should be what you want, Extra Life

#16 – EXTRA LIFE (3)

  • Here you should notice the Extra Life through a locked door, darn how are we supposed to get past that? Simple really and you can begin by turning around and jumping into the water here
  • Follow the tunnel underwater North, in the direction of the locked door
  • Don’t stray from the tunnel though, instead keep following it. Eventually you should reach an area in this tunnel that you can climb through and back out of the water
  • Out of the water now, turn and go backwards through the tunnel in the direction that you came from. It will eventually lead you to the Extra Life

#17 – SECRET AREA (5)

  • Here jump into the water, there will be an air bubble below you, should you need it
  • However, below that will be a smashable segment in the floor. Smash through this and how lovely yet another Blue Orb!

#18 – BFG AMMO

  • Here find an area with blue energy sprouting out of it, this blue energy will actually push you into the air
  • After being thrown into the air, land on the next platform in order to find the BFG Ammo

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