Surviving in Doom is all dependent on what weapons you have. Some guns are easy to find while others are hidden in nooks and crannies. Check out this Doom Weapon Location Guide to help you find all the weapons as you go!
Doom Weapon Location Guide
Go into the hallway outside the room and then look right for a hatch that you can open now. Go down the hatch and then go up the other hatch on the other side. Go near the blood smear on the wall up there to find the Plasma Rifle.
During Kadingir Sanctum right after going through the red three skulled door you will take a teleporter. This teleporter will lead to an area with some supplies before a pretty big fight. If you walk to the edge after the hallway and look down you will see a power up and a path going left. Take the path going left and you will get a secret and a Chaingun early
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