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Biological Waste Processing Plant

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Biological Waste Processing Plant
General information

200-, during the Black Mesa Incident


Black Mesa Research Facility


Black Mesa Incident


Black Mesa

Game information

c2a4, c2a4a, c2a4b, c2a4c


Dario Casali[1] (level design)

The Biological Waste Processing Plant is a Black Mesa Research Facility area covering the Half-Life chapter Residue Processing.


Hazardous waste tanks inside the plant.
  • It is first mentioned by Black Mesa Announcement System in Sector D in a message asking for an "emergency clean-up team." This probably refers to a chemical or toxic spill, though the plant seems to be in proper working order when visited in-game.
  • Upon reaching the area during the Half-Life chapter Residue Processing, Gordon Freeman escapes certain death from a garbage compactor located near the processing plant, and reaches it from the outside. He then must work his way through a network of waste processing machines in order to progress further towards the Lambda Complex.

Behind the scenes[edit]

The name of that area is given in one of several unused Black Mesa Announcement System announcements found in the file "sentences.txt" that were to be heard in Sector D's Administration Center. The plant is also mentioned as a location sharing its announcements with that of the Advanced Biological Research Lab. The related sentences use the prefix "C2A4", which is the name of the first map of the plant.


List of appearances[edit]


  1. Interview with Dario Casali on Dev Game Club (July 12, 2017)
Preceded by
Sector E Materials Transport
Half-Life story arc journey Succeeded by
Alien Research Labs