Warzone 2 DMZ guide: How to unlock the Secret Bunker door in Koschei Complex

The Season 3 Patch of Warzone 2 has brought in a significant amount of new content to the game. One of the major highlights among them is the new Koschei Complex map, which has been added to the DMZ mode. It is a sprawling subterranean bunker complex underneath Al Mazrah, and has many sub-areas for the players to explore and challenge each other in.

Alongside the main areas of Koschei complex, the new Warzone 2 DMZ map also has many secret rooms for the players to find, which contain some of the best loots of the new map. The Secret Bunker is one such obscure room, and it can be found in the Alpha Cluster area of Koschei complex.

However, the door to it can't be opened by just interacting with it and it requires players to solve a puzzle to unlock it. As such, this article will explain the process of opening the door for the reference of the readers.

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How to open Alpha Cluster's Secret Bunker door in Warzone 2 DMZ Koschei Complex

In Warzone 2 DMZ, there are two secret rooms in the Alpha Cluster section of the Koschei Complex. Located on the Southern wall of Alpha Cluster, the Secret Bunker door is guarded by two sentry turrets and quite a few armored AI enemies.

The door of the Secret Bunker with the keypad beside it in the Alpha Cluster sector of Koschei Complex (Image via Activision)

Once you clear the area of the hostile elements, you will find a door behind the destroyed sentry turrets with a keypad beside it. Now, you will have to look above the keypad with a R4D detector, which is a must-have item to open this locked door.

R4D detector of Warzone 2 DMZ mode (Image via Activision)

The R4D detector can be found in the Chemical Plant area of Koschei Complex and you must have one in your invertory before attempting to open the door of the Secret Bunker. Using the device, you will have to look just above the keypad to find a code with three Russian letters. This code is not visible normally, and will only be revealed when you are using the R4D detector.

Use to R4D detector to get the hidden code above the keypad in Warzone 2 DMZ (Image via Activision)

These three letters are hints to the three digit number that you will have to enter in the keypad to unlock the Secret Bunker's door. Once the code is visible with the R4D detector, you are advised to keep a screenshot of it.

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How to solve Russian letter puzzle of Secret Bunker door of Koschei Complex

Four blackboards like this is scattered in the Alpha Cluster (Image via Activision)

Once you have taken a screenshot of the code, you will have to find four blank blackboards that are scattered in the Alpha Cluster area and use the R4D detector to reveal the hidden content.

Once again, you are advised to keep a screenshot of the hidden content of the four blackboards as they are the the key to solving the keypad puzzle of the Secret Bunker's door.

Looking at the blackboard through R4D detector reveals something like this (Image via Activison)

Once you have all four screenshots, you will now have to carefully analyze the images to find a number being mutually pointed towards with arrows with the Russian letters of the hidden code of the keypad. Once you have the numbers corrosponding to the three hidden code characters, you will have to enter the three digits in the keypad in the left-to-right sequence.

Players will have look carefully and find the numbers corresponding to the three letter Russian code (Image via Activision)

If you enter the numbers correctly, you will see the door beside the keypad get unlocked. Behind the now-open door is the Secret Bunker, which will contain a lot of high-tier loot. The available materials include a Golden Skull and one of the attachments of the Heated Madness Kastov-762 blueprint.

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This is the complete process of unlocking the door of the Secret Bunker in the Alpha Cluster section of Koschei Complex in Warzone 2 DMZ.