Watch out for the wraith that jumps down, and avoid holes in the floor. Kill some imps and wraiths as you cross the walkway, go through the door and wait for the debris to settle before running across. Watch out for trites when it opens, grab Robert CodyвЂ™s PDA off the desk and head through the next door. Kill the wraith on your right and hit the control panel to go through the door on your right. Kill five cacodemons through the door at the top and take the ladder down then enter the door. Jump back over the pipe and use the control panel to extend the ladder then climb all the way up and climb the next three ladders as well. Katayama and grab the keycard on the desk next to him. Grab the pick ups and crouch and crawl to your right. When you reach the bottom grab the pick ups on the right then jump over the pipe to the left. Climb down two more ladders and then jump from platform to platform to make your down to the walkway where thereвЂ™s another ladder to descend. ThereвЂ™s an imp behind the door and some ammo to the left, take the ladder on the right down. Kill two cacodemons, go round to the right, climb the ladder and go through the door at the top. Kill the two imps that spawn in and then the trite and go through the right door. Use the medical station on your left and get onto the lift hitting the control panel to take it up. Climb it and kill the wraith at the top.Д¬heck behind the box on your left for ammo then go through the door and kill the wraith and imp on your left. Grab the medkit on the right and then hit the control panel on the left to lower the service ladder. An archvile will spawn in above you and then a couple of imps ahead and two cacodemons. Kill the chaingun commando at the bottom and make your way across the broken metal. Kill the hellknight and imps that spawn in while you wait then take the lift down into the depths. Head through the door at the back, grab the BFG and other ammo on the right then go back the way you came and call the service lift. Kill two cacodemons and then jump across to the booth and hit the control panel inside to unlock the cargo lift controls. Take the door on the left and go to the top right corner, hit the control panel and lower the ladder then climb it. Kill the trites and the imp and use the medical station to your left. Turn right up the stairs to kill two chaingun commandos on your right then loop back round and go through the next door. Grab the medkit off the desk to your left and go down the stairs. An archvile will spawn in as you advance, then an imp and maggot to your right.

Doom bfg walkthrough guide