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Main Quest · Mauer der Toten

Tin Man Heart

Mauer der Toten’s main quest hunts Aleksandra Valentina, the Omega insider who tore the Berlin breach open, and closes it the hard way: a warhead assembled from satellite-cleansed uranium, carried into the Dark Aether by Klaus himself. It needs the CRBR-S with its Blazer mod and an upgraded Klaus, ends with a Valentina boss fight and an escort finale, and pays out the Tin Man Heart Dark Ops calling card — there is no console achievement attached. Fully soloable.

Difficulty: HardSolo availableSpoilers: high
Start Guided ModeJump to steps
Still from “Mauer Der Toten Trailer | Season Four | Call of Duty®: Black Ops Cold War - Zombies”
Mauer der Toten · Call of Duty via YouTubeOpen tac map

Spoiler warning

This walkthrough reveals the map's finale. Continue only if you want to know how it ends.

Preparation

Before you start

Prerequisites

  • • Power on and Pack-a-Punch unlocked (the Disciple ritual)
  • • Klaus built and upgraded at least once
  • • The CRBR-S, plus its Blazer mod kit

Walkthrough

Step by step

  1. 01

    Build Klaus’s hacking helm

    Shoot the rooftop antenna, the Ghost Station panel and the Electronics Store radios with the CRBR-S, and hand the parts to Klaus.

  2. 02

    Breach the hidden lab

    Have Klaus punch through the Sewer Access brick wall, then melt the reinforced wall behind it with the Blazer to open Valentina’s Endstation lab.

  3. 03

    Fill the canisters

    Slot the lab’s three empty canisters into essence harvesters around the map and kill lured Tempests beside each until it glows purple.

  4. 04

    Stop the ghost train

    Flip the railway switch, send Klaus onto the Ghost Station tracks to catch the train bare-handed, and loot the keycard and warhead from inside.

  5. 05

    Fire the satellite

    Activate the uplink with the keycard and survive the timed defence — a splitting Megaton-class HVT included — then collect the uranium it leaves behind.

  6. 06

    Cleanse two rocks

    Craft uranium devices, place them at the rooftop points, let the satellite beam cleanse them, and seat both cleansed rocks in the warhead — the satellite cycle runs twice.

  7. 07

    Valentina

    Fight her in the lab: she shields, teleports, rains fire needles and eats zombies to heal. Put her down.

  8. 08

    Klaus’s last walk

    Escort Klaus as he carries the warhead to the Dark Aether portal. He says goodbye, walks in, and detonates it — sealing the breach.

    The quest’s name lands here: the tin man had a heart after all. The outro sends the story straight into Forsaken.

Following along in-game? Switch to Guided Mode for one step at a time on a screen you can read at arm's length.

References

  1. 1.Mauer der Toten main quest guide — Dexerto — Dexerto. dexerto.com · accessed Jul 22, 2026Community-verifiedcorroborate
  2. 2.Black Ops Cold War Season Four: Mauer der Toten Zombies Tips (Official) — Call of Duty (Activision / Treyarch). callofduty.com · Jul 16, 2021 · accessed Jul 22, 2026Official

Last reviewed Jul 15, 2026. Spotted an error? Suggest a correction.