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The subject of this article appears in Call of Duty: Black Ops 4 The subject of this article appeared in Zombies mode

Cold War Remedy is the achievement/trophy for the map Classified, in which the Ultimis crew must locate and retrieve the Project Skadi weapon prototype. It is also the Easter Egg for acquiring a free Winter's Howl within Classified.

Preparation of Reactivation

Within the War Room, there is a machine with a large monitor showing aerial photographs. On the side of it there is a split-flap display of four numbers with a red activation button on it. This is used to activate Project Skadi by imputing four sets of numbers printed on pictures of aerial views of Shi No Numa, Der Riese, Kino der Toten and Shangri-La.

Shi No Numa Photograph

On the Deserted Hallway, between the doorway to the Conference Room and elevator to the War Room, there are a set of portraits of various Presidents with golden nameplates stating whom is whom. Using a weapon that has been Pack-a-Punched, shoot once at the nameplates of:

  • George Washington
  • Benjamin Franklin
  • Alexander Hamilton
  • Abraham Lincoln

Upon shooting the final nameplate, the nameplate of George Washington will lift up and reveal a hidden compartment that holds a photograph of Shi No Numa that has four randomized numbers printed on it.

Der Riese Photograph

The Der Riese photograph is locked in a desk within the middle of the Main Offices. The key for the desk is within a key box beside the Panic Room, on the opposite side of the Cola Perk-a-Cola machine. Opening the drawer reveals the photograph.

Kino der Toten Photograph

The Kino der Toten photograph is hidden within the Panic Room behind an active monitor, however to move the monitor, the DEFCON switches must be activated in a specific order:

  • War Room: Upper Level, opposite side of the elevator
  • Server Room
  • War Room: Upper Level, closest to the elevator
  • War Room: Lower Level

With the DEFCON level now at five, teleport to the Panic Room, look at the monitors on the left side of the room and interact with the monitor that is broadcasting static to have it be pushed back and reveal the photograph.

Shangri-La Photograph

Within the South Laboratories, outside the window closest to the door to Weapons Testing and the Koshka wall buy, throw an explosive equipment item, such as the Acid Bomb or Fragmentation Grenade at the lighting fixture nearest to the wiring box. If the explosion hits the wiring box, the photograph will be teleported beside the window and affixed to the wall.

Reactivating Project Skadi

With the four sets of numbers from the photographs, the player must input them into the machine within the War Room by shooting at the split-flap numbers and interacting with the button. To activate the project, The numbers must be input in order of:

  • Shi No Numa
  • Der Riese
  • Shangri-la
  • Kino der Toten

If input correctly, the button will spark and become inoperable. After a short delay, the monitor will turn to static and have the line of "PROJECT SKADI RETRIEVED" on it.

Retrieving Project Skadi

Return to Groom Lake and within the second cleaned area, there is a metal briefcase with "PROJECT SKADI" emblazoned on it. Interacting with it reveals inside the Winter's Howl, which can be picked up by a single player. Doing so will award the achievement.