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Part 4
Half-Life: Opposing Force

Part 4

Follow the green wall stripe to find the HEV suit room and prepare for action in Half-Life: Opposing Force Part 4.

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Follow the green wall stripe to find the HEV suit room and prepare for action in Half-Life: Opposing Force Part 4.

Walkthrough
  1. 1
    Leave the break room and follow the green wall stripe to the employee locker room.
  2. 2
    In the back left corner of the locker room, use the HEV suit room's control panel to open a case with a suit inside.
  3. 3
    Walk into the case to put on the HEV suit.
  4. 4
    Find the locker labeled "Freeman" near the bathroom entrance, open its door, and go inside to pick up an armor battery.
  5. 5
    Check the wall-mounted first aid station (skip if health is 100) around the corner.
  6. 6
    Go back the way you came, then proceed down the corridor with the blue wall stripe to the security post.
  7. 7
    The guard will open the nearby security door once you have your HEV suit on.
  8. 8
    Go through the security door and the next door to load section c1a0a.
  9. 9
    In section c1a0a, use the button panel to the left of some doors to open them.
  10. 10
    Get on the lift past the doors and use its button to descend to a lower level (or climb down the side ladder).
  11. 11
    Go through some doors and down a corridor until section c1a0b loads.
  12. 12
    In section c1a0b, enter the control room and wait for three scientists to talk.
  13. 13
    After a scientist uses a retinal scanner, go through the unlocked door.
  14. 14
    Find two scientists discussing equipment problems.
  15. 15
    Across from them, use a button panel to summon a lift, then use its button panel to go up a level.
  16. 16
    Exit the lift and go down the corridor until the test chamber door loads section c1a0e.
  17. 17
    In section c1a0e, enter the test chamber's outer room and wait for two scientists to open the main test chamber doors.
  18. 18
    Go through the main doors and across the chamber to a small ramp.
  19. 19
    Climb the ladder on the wall past the ramp to reach an upper walkway.
  20. 20
    Use the walkway's computer panel and wait for the red glass cover (press the cover button to crouch behind walls or objects) on the button to rise.
  21. 21
    Use the button to power up the scanning machine.
  22. 22
    Climb back down the ladder and stand next to the cage near the ramp's bottom.
  23. 23
    When the "specimen" arrives, do a quicksave.
  24. 24
    Get behind the specimen's mounting gadget and push it into the scanning beam.
  25. 25
    Move back a bit and wait to be teleported to border world locations, leading to the "Unforeseen Consequences" chapter.
  26. 26
    In section c1a0c, check if a vortigaunt is in the test chamber ruins with you; if so, restore your quicksave and repeat the teleportation process.
  27. 27
    Leave the test chamber through the jammed-open doors.
  28. 28
    Try using the retinal scan device next to the exit door to open it.
  29. 29
    Go through the door and find a scientist trying to revive a security guard.
  30. 30
    Go around the corner and move forward slowly.
  31. 31
    After a computer bank falls over, jump over the debris in the corridor leading to the lift.
  32. 32
    Get in the lift and use its button.
  33. 33
    Go through the doors and over to two scientists.
  34. 34
    After they finish talking, get the scientist (Dr. Vance) to follow you to the control room door's retinal scanner.
  35. 35
    After he opens the door, move into the room and wait for an electrical surge to blow up the door at the other end.
  36. 36
    Carefully time your run across the room to avoid being zapped.
  37. 37
    In the next hallway, section c1a1 will load.
  38. 38
    In section c1a1, run through the next room quickly as a headcrab will teleport in.
  39. 39
    In the next hallway, crouch-walk under the first red laser beam.
  40. 40
    Run around the second laser beam after it breaks free and slices through a security guard's body.
  41. 41
    Pick up the crowbar next to the nearby doors.
  42. 42
    Go back past the two laser beams to the room where the headcrab teleported.
  43. 43
    Quicksave before entering the room.
  44. 44
    If the headcrab is levitating, go around the fallen pillar, right-strafe to dodge its leap, turn, run up to it, crouch, and crowbar-whack it.
Tips
  • First aid stations make a "hee-yee-hee-yee" sound when used unless your health is 100.
  • The security guard you can potentially take with you cannot get over nearby rubble.
  • Do not pull the specimen's mounting gadget out of the scanning beam after pushing it in, as this will almost certainly cause a vortigaunt to appear.
  • If a headcrab teleports into a room and you have no weapon, exit the room as quickly as possible.
  • If the headcrab is levitating, you must dodge its leap and then quickly attack it with the crowbar before it can react again.

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