After updating to Call of Duty on May 18, players began opening bunkers in Warzone, which had been placed on the map since the release of the “Royal Battle”. StrangerRobijn user with reddit marked the locations of the phones with which you can get into the shelter and access the secret drawing of Mud Drauber for MP7.
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To open most bunkers, you need to get a key card – it falls out of the legendary chests. However, the drawing for MP7 is located in Refuge No. 11, which is located in the north of the map. You can get into it by performing a certain series of actions.
To open the eleventh bunker, you need to find one of the phones that are located on the map. In the picture they are marked in red, and each of them has a specific number. When you answer the call, you will hear a voice that dictates three numbers. Phones must be activated in the same order in which they were announced. After completing the task, the hopper door will open.
There are several rooms in the shelter. If you move along the corridors and go through the door to the right, you can find the secret MP7. You need to take up arms, and then in your inventory a drawing of Mud Drauber for MP7 will open.