If order to reveal the room connected withDoomyou have to go to the Gearhead Vault.
It will be done in the mission with the same name.
Once you kill them aim at the nearest keyboard in front of the monitor and pressE.
You’ll hear the characteristic sound then.
To the left from the entrance you’ll see the black door.
Enter the room behind the door, jumping over the boxes and stand on the platform with shining diamond.
You’ll be moved to the level from Doom.
On the right you could see the stairs leading to the Doom Marine statue.
It can be sold at trader for some money.
you’re able to leave the room by standing on the diamond tile once again.
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