Doom Eternal: The Ancient Gods Part 1 UAC Atlantica Facility Collectible Locations

UAC Atlantica Facility is the 1st mission in Doom Eternal: The Ancient Gods Part 1 and contains 12 collectible locations (4 Codex pages, 1 Support Rune, 1 Slayer Key, 1 Slayer Gate, 1 Empyrean Key, 2 Secret Encounters, 4 Extra Lives). This walkthrough will guide you to all UAC Atlantica Facility collectibles in Doom Eternal: The Ancient Gods Part 1.

Codex pages: 4
Support Runes: 1
Slayer Keys: 1
Slayer Gate: 1
Secret Encounters: 2
Extra Lives: 4

All collectibles in this chapter are listed in chronological order. If you miss anything you can use fast travel when it unlocks at the end of the mission to go back everywhere.

Codex #1 (Book of the Seraphs – Part 1) – After getting the blue keycard, go to the left side door instead of the right one from the starting point, then go down the ramps to find this codex at the bottom.

Extra Life #1 – After the encounter in the room with the multiple turrets, platform up to the vent where you need to go to progress. Instead of going left and dropping down, go to the left to the dead end, then look up into the ceiling to find this Extra Life.

Secret Encounter #1 – After going up the elevator, instead of going forward jump down to the level below. This secret encounter spawns an Empowered Mancusbus, two Carcass, and a few zombies enemies directly behind you from where you are after activating the encounter. Focus hard on the Mancubus first, then clean up the other few enemies quickly after.

Codex #2 (Book of the Seraphs – Part 2) – After going up the elevator, jump across to where the enemies are to progress. Before using the punch button to progress, go up the ramp to the left to find this codex.

Codex #3 (Book of the Seraphs – Part 3) – After using the fan and the swing bar to launch yourself across the large gap, before going up the stairs go around to the right of the platform to find this codex in the dead end.

Codex #4 (Book of the Seraphs – Part 4) – After the encounter that has the Doom Hunter at the end, proceed through the door to progress. Instead of going up the ramp, stay on the floor you’re on and walk behind the ramp to find the least codex for this level.

Automap Station – Proceed down the hallway with the tentacles, then past the Slayer Gate. In the room after the hallway you should see this directly in front.

Slayer Key #1, Slayer Gate #1, Support Rune #1 – From the Automap Station, climb up the boxes to the left and then look over the edge of the area to find some swing bars. Jump across those, then to the right to find a vent you can go through to reach this key. Follow the path back to the Slayer Gate.

Secret Encounter #2 – In the room with the water on the right side, before progressing you can go into a room that has a dive suit in it. In this room there is also a console that you can activate, which raises the pistons in the water, allowing you to get behind them. In the leftmost piston, you can find a room with this secret encounter. This encounter spawns a group of 4 Spectres. Immediately use the flamethrower and shoot your grenade to weapon them, just start taking them out as quick as you can.

Extra Life #2 – After the next punch button that lets you swing over and ride a crate, climb the wall to get to the door with the current objective marker. Instead of going towards it, go the other way along the walkway to find the second extra life for this level. Note that when you get near it an Empowered Dread Knight will spawn, then after grabbing it an Archville will spawn.

Extra Life #3/4 – After taking the submarine underwater, you’ll be in a large circular area. There will be a point where you have to go back underwater to continue to the objective. Instead of progressing here into the center of the area, continue underwater to the next point in the tunnel that you can exit the water, then go to the end of the tunnel to find this 2x Up.