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Game information



  • c2a3
  • c2a3a
  • c2a3b
  • c2a3c
  • c2a3d
  • c2a3e
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On A Rail

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Residue Processing

Apprehension is the ninth chapter of Half-Life.


For the the game's full story, see the Half-Life storyline article.

The chapter takes place in a large flooded underground industrial area infested with aquatic alien creatures. At the beginning of the chapter, the Rail Cart goes off the tracks, and crashes into an abandoned silo. The next area is a large room with a pool in the center. The player enters to see an Ichthyosaur jumping out of the water and killing a scientist. The scientist in the observation room was told that the creature was hauled from the Challenger Deep. He suggests the player to use the tranquilizer gun in the shark cage to kill the creature.

There is a scientist in a room near the generator area. He unlocks the door when the player kills all the creatures nearby, and warns the player about the next area. Inside is a cryogenic storage area with large tanks.[1] Eventually, the player comes across a security guard with an urgent message to deliver to the player, but he gets killed by the Black Ops assassins in mid-sentence. The player is ambushed and captured by the Marines in the following area. They throw the unconscious player into a trash compactor, but the player wakes up and escapes before he gets crushed.


Other versions[edit]

The level code for the chapter is Fear Finds Gordon in the Dreamcast version. Half-Life: Source contains a couple of test maps that include portions of the chapter.[2]


Half-Life expansions[edit]

In Blue Shift, Gordon is seen dragged by the Marines from Barney Calhoun's perspective in the chapter Deliverance. A cut mission in Decay involved the rescue of Gordon from the trash compactor. The original level was also updated to reflect the changes done for the mission in the PlayStation 2 version.

Behind the scenes[edit]

The original chapter title was Abandoned Silo.[3] The abandoned silo is actually the early version of the silo from the chapter Blast Pit. The cut alien enemy Archer was to appear in the flooded hallways in the map c2a3. They were replaced with Leeches in the final version of the game. There is an unused trigger for the track Nuclear Mission Jam in the map c2a3. The track plays on map load in the Source version of the game. This is most likely an oversight. The map c2a3c uses a dawn texture set for the skybox, even though the sky is not visible anywhere in the map. The set itself is not included in the game, but it can be found in Day One's files.

Animations for the ambush scene were created but left unused. This sequence shows Gordon being captured by the military from the view of a security camera, a leftover from when third person cutscenes were still planned for the game.[4] The animations can also be found in Day One's files.


"Apprehension" possesses a double meaning. Apprehension is a feeling of dread or anxiety, which can be felt in the claustrophobic, leech infested spaces of the chapter. However, it can also mean "to be captured," as Freeman is at the chapter's end.





Associated media[edit]


  1. Half-Life Audio Script
  2. Half-Life: Source (maps/hl1devtestc)
  3. Half-Life: Day One (titles.txt)
  4. Marc Laidlaw on Gina as an alternate playable character in Half-Life (September 1, 2016)