DOOM 2016 – The fourth secret room
Coming out of the main door, turn left. To get to the other side of the cave, you will need to climb to a two-story structure, but first need to jump on the first floor.
There, on the left side, you will see a ladder formed by the rock climb on it. From there, jump to the ledge in front, and then to the other side of the cave.
From radiant green shine runes go left.
On the platform at the wall will be hidden lever.
It is enclosed by the barrels, so see it with the naked eye is difficult.