Delta Labs 3 and 4 Walkthrough: Level 18 and 19 of Doom 3

Grab the medkit on your right and head through the door, kill a z-sec and a commando will come out of an alcove ahead. Kill another two z-secs and grab the pick ups in the alcove.

Enter the security station and use the control panel to open the locked door and then turn and kill the commando. Use the medical station and come out taking the door on the right.

Take the first door on your right into the toilet and kill a z-sec and a commando then grab the armor in the stall at the top left. Head back out, kill the imp that drops down and take the door on your right.

Kill the imp that spawns in ahead, and also two z-secs, another imp behind you and then a z-sec and imp in the room to the right.

Grab Frank Cerano’s PDA from the desk and a medkit from the second office on the right and then go through the door. Kill the commando who jumps down and the chaingun commando above. Then head through the door straight ahead and use the medical station.

Grab Han Lee’s PDA off the desk on your right and use the control panel further up to cycle the chamber. Come back out, kill an imp and commando and take the door on your left. Once you are decontaminated head through the next door and kill an imp on your right and then a commando.

Go through the door on your right and use code 836 to open the cabinets before going through the next door.

Kill a commando who approaches from the right and a chaingun commando up to your left. Head over to the desk on the left and use the control panel at the far end to open another control panel and use it to scan for active pads.

Select Pad 2, Balcony and then jump onto the teleporter and activate the sequence. Kill the revenant straight ahead and grab the medkit on your right before going through the next door; after decontamination head through the next door.

Kill the chaingun commando ahead and then take the door on the right into a storage room and kill the z-sec and imp before hoovering up all the goodies. There’s also a medical station at the back of the room.

Head back out and take the door on the right; there’s a z-sec to your right and then a revenant and two imps spawn in. Go through the door on the right into the security station and use the medical station and then use the control panel to unlock the door.

Come back out and kill a chaingun commando and a commando then go right and through the next door. Kill the imp and the z-sec and head through the door straight ahead.

Kill the four imps that spawn and check the offices on your left for pick ups. Kill a chaingun commando and two more imps the follow the corridor round and drop down and crouch in the hole in the floor.

Take the first left in the tunnel and head straight along and up into the next room. Take the left door and kill an imp then grab the pick ups. Go back through and take the right door, kill two revenants and activate the teleporter via the two control panels.

This time select Pad 3, jump on the teleporter and activate the sequence. Grab the items from the shelves and head through the door, grab some more pick ups and head through the next door.