Die Maschine — Black Ops Cold War Zombies Easter Egg Guide

Buy a route from the Yard down through the facility, then flip the main power switch. Use both terminals to stabilise the accelerator and open the Dark Aether portal. Step through, follow the Aether Tunnel, collect the Machine Part, return, and install it on the central frame to forge Pack-a-Punch.

Tip: Open this whole loop before the first Megaton so every upgrade area is reachable.

Order isn't strict. These steps aren't hard-locked — you can collect parts and unlock elements in whatever order suits your run. A few actions do have prerequisites (e.g. Electrobolt needs the Aetherscope/diary step done first), and those are flagged where they matter.

The golden keycard is a guaranteed drop from the first Megaton you kill (the first spawns around round 8, and all its split forms must die). Grab it and use it on the weapon locker in the Weapons Lab to take the D.I.E. Remote. Insert the remote at the broken wall in Nacht's Living Room, activate suction, and feed it zombies until charged, then interact to blast the door and collect the D.I.E. Shockwave.

Tip: Primary fire launches a shockwave; alternate fire vacuums zombies and ammo. Preserve the base weapon until all four ports are charged.

Vacuum the empty canister off the mezzanine ledge above Nacht. Place it in the Cleaning Unit in the Weapons Lab and kill a Plaguehound beside it to fill it with gas. Install the charged canister at the Crash Site crate, melee it, and collect D.I.E. Nova-5.

Shoot the ledge crate on the Penthouse roof edge to drop the flask. At the Pond, bait a Megaton ranged blast into the tree fungus to mutate it, place the flask beneath it, wait about a minute, then carry the filled flask to the D.I.E. weapon crate right next to Speed Cola (Medical Bay) and interact with it to claim D.I.E. Cryo-Emitter.

Enter the lowest Particle Accelerator anomaly, then collect one orange crystal charge at a time with alternate fire, returning to fire each into the yellow accelerator crate.

Tip: Requires the Aetherscope/diary stage done first, and you can only carry one charge at a time.

• Crash Site crystal near Jugger-Nog
• Penthouse crystal near Der Wunderfizz
• Pond crystal near the Mystery Box

Take the Pond Dark Aether portal, open the fuse box beside the Crash Site Aether Tunnel, and insert the fuse into the Plasma Cutter in the Weapons Lab while still in the Dark Aether. Return to normal space and open the fire crate at the Pond to collect D.I.E. Thermophasic.

Part A — the Aetherscope. Collect the three Aetherscope parts in the Dark Aether, then build the device at the bench behind Pack-a-Punch. Only one part is active at a time and the order is random, so recheck all three spots after each pickup.

Part B — the diary. Trigger the Medical Bay anomaly and take Vogel's Diary from the upper desk. Enter the Dark Aether and visit three Spectral Reflections in order: activate each anomaly, then activate the ghost to hand over the diary and let it finish speaking. Then return to the Medical Bay computer (next to where the diary was) and hold interact — the password enters automatically; there is nothing to type or decode.

If the Medical Bay anomaly hasn't spawned, flip rounds until it does. You can hit all three Vogel anomalies/ghosts one after another without waiting for the dialogue to finish — this saves several minutes. And in the Dark Aether, avoid the red 'Mayak' Megaton — don't fight it.

Tip: the two halves are separate — you build the Aetherscope from the parts, and the diary delivery is its own chain (the three ghost spots below are only visible while you're in the Dark Aether).

• Aetherscope part — Particle Accelerator, centre stairs by the portal
• Aetherscope part — Crash Site, by the plane wreck
• Aetherscope part — Yard, under the stairs by the workbench
• Diary ghost 1 — Medical Bay, under Vogel's office (by Speed Cola)
• Diary ghost 2 — Control Room, behind equipment on the right (facing the trial machine)
• Diary ghost 3 — Particle Accelerator, in front of the Aetherscope bench

Fire each D.I.E. element into its matching coloured corner of the hanging test chamber above Speed Cola; the fuse flips upward when you hit the right one.

Fire is the RED corner (nearest Speed Cola) — not orange, a common guide error. Element → port colour map. The four D.I.E. elements are variants, not one-way upgrades — swap freely at their crates at any time, so one player can cycle all four solo.

• Nova-5 into green
• Cryo-Emitter into blue
• Electrobolt into yellow
• Thermophasic into red (corner nearest Speed Cola)

First get the Dark Aether Wrench: interact with the portal that has appeared in the Medical Bay to spawn an anomaly, step into the Dark Aether, and let the two Soviet spectral reflections on the ledge finish talking about the Decontamination Agent. When the sequence ends and you are back in normal space, the wrench is waiting on the ground right where the ghosts spoke (by Speed Cola).

In the Yard, strike the tank three times with the wrench, kill the zombie that crawls out, then attach a lethal (Semtex) to the open hatch to fire it — the shot knocks a branch off a tree near the plane, dropping the Decontamination Agent by the front of the plane wreck at the Crash Site. Carry it to the Medical Bay electrical box (where the ghosts were talking) and insert it.

Tip: You cannot sprint, mantle or fast-travel while carrying the agent — clear your path first.

Split a Megaton and lure both halves under the Medical Bay chamber one at a time (keep both alive) so they're sucked in. Once both are captured, go up to Dr. Vogel's office and interact with his computer to start the procedure — in co-op every player must be at the computer — and let the cutscene play out.

Finish all preparation now. Then activate the final anomaly at the Nacht der Untoten Living Room and interact with Orlov's spectral reflection; after his monologue his family photo appears on the table in that corner. Interacting with the photo launches the finale.

Tip: The photo is the point of no return — buy armour, perks, ammo, self-revive, tacticals and support before touching it.

Orlov works three terminals — Magnetic Containment, Primary Coolant, and Fail-Safe. He is invincible but stalls whenever zombies touch him, so clear the close ring first and burn down Megatons fast. When the machine seals, run the 90-second escape: Weapons Lab, Control Room, Tunnel, Crash Site, then the Pond exfil helicopter before the timer expires.

Tip: Ring of Fire and Aether Shroud shorten the Orlov stalls and bypass bad escape chokepoints.