Part 12

Navigate Part 12 of Half-Life: Opposing Force, dealing with vortigaunts, turrets, and marines. Find supplies and advance through the facility.

Walkthrough:

1. As you approach the teleport-in point for vortigaunts (non-player characters that will only appear when you get close), check the area they teleported into. You will find a first aid station and two bullet clips next to a dead security guard.
2. Vandalize soda machines and run over orange bugs if you wish, then proceed down the hallway to the bottom of a large ramp.
3. Get out your shotgun and quicksave (save your game). Jump over the red laser alert beam.
4. Turn to face the two nearby explosive barrels. Blast them with the shotgun the instant a vortigaunt teleports in next to them to kill it. A good double-barrel blast will kill the second vortigaunt that appears.
5. Alternatively, to skip the fight, jump over the laser alert's right end and immediately run to the right so the first vortigaunt does not see you. If you carefully stay out of its sight, you can leave it there, and it will not bother you.
6. It is possible to sneak-attack the two nearby turrets, but it is not necessary. The turrets you need to destroy are on the other side of large green crate stacks.
7. Bash the two large wooden crates that are next to each other to reveal one of the turrets past them. Move to where you can only see one leg of the turret, then shoot it with the pistol until it is destroyed.
8. For the other turret, go around to the right side of the green crate stacks, bash the wooden crate there, and then shoot the turret leg you can see past it.
9. Hop up to the top of the biggest green crate stack. You will need to use a jump-crouch maneuver to get onto the uppermost crate.
10. Once on top, drop down to the floor past the stacks, run through the fire door, and jump up onto the green crate stack past it. If you are fast enough, you can drop into the next area, where section c1a3d loads, without any teleport-in headcrabs (enemies that teleport in) catching up to you.
11. Section c1a3d: MEET THE MARINES
12. Crouch-walk very carefully on the super-slick wet floor until you can see the nearest of the two turrets around the corner.
13. Move to where you can only see one leg of the turret and shoot it until it falls over. Repeat this process for the second turret, which is farther down, near the fire door's glass-covered button. You will have to crouch-walk very slowly and carefully to get into a position where you can shoot it without being shot.
14. Alternatively, you can try tossing hand grenades so they bounce toward the turret, or charge it with the shotgun as soon as the first turret is destroyed.
15. After both turrets are destroyed, check past the fire door for any unexploded tripmines (explosive devices) along the left wall. If present, stand back and shoot the nearest one with the pistol.
16. Go through the fire door to find a first aid station and several boxes to bash for supplies.
17. Climb a ladder to reach a walkway with more boxes to bash.
18. After going up another ladder, get your assault rifle out and move along the walkway until you can look down into a room containing a marine (an enemy soldier).
19. The marine is hostile, so immediately open fire on him. You should be able to kill him before taking much, if any, damage. If you do get damaged, return to the previous room for health and armor.
20. Go down to the lower floor and look for an aid station and some assault rifle clips on a green crate. There is also a rifle next to a dead marine.
21. When ready, press the button to the left of the large lift to open it. If you saved a scientist (a non-player character), he will not be useful in the area ahead, but you can have him follow you and then hit the lift's interior button to slam its doors shut on him.
22. As you ride the lift up, section c1a3a will load.
23. Section c1a3a: MORE FLOOR TURRETS AND SEVERAL MARINE SQUADS
24. After the lift stops, stay back while a scientist runs forward and is shot by the three marines in the area ahead.
25. Stay in the lift with your assault rifle ready and shoot any marines you see running around on the upper walkway ahead.
26. Find the dark passageway to the left as you exit the lift. Go back and forth in it, dodging grenades and shooting marines with the assault rifle when possible.
27. The marines will likely run into the side area with you, making it unsafe. Try to kill the marine on the upper walkway with the pistol first.
28. Wait near the side area's entrance with the shotgun ready for a marine to get near some explosive barrels. Blow them up, then engage any survivors with the assault rifle.
29. After all three marines are destroyed, search the area thoroughly and bash wooden crates to find supplies.
30. If you need more health or armor, use the first aid and HEV (Hazardous Environment) stations near the back right corner of the area. You can also take the lift back down to previous areas to collect leftover supplies.
31. When ready to proceed, find the stairs leading to the upper walkway. Go through the fire door and along a wide bridge, being mindful of barnacle tongues (hanging, tentacled creatures that grab prey).
32. If barnacle tongues are difficult to avoid, even when crouch-walking, look up and kill the barnacles with the assault rifle before passing under them.
33. You can use the barnacle whose tongue dangles closest to the bridge above you as a shortcut to get onto the bridge. Quicksave before attempting this.
34. While facing the bridge and looking up, let the barnacle grab you and pull you up. Hit it with the crowbar when within range, then hold the