This subject is related to the Black Mesa Incident era.
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Sector A

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Sector A composite.jpg
Sector A
General information

200-, during the Black Mesa Incident


Black Mesa Research Facility


Black Mesa Incident


Black Mesa



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Half-Life: Blue Shift

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"Hello and welcome to the Black Mesa Hazard Course, where you'll be trained in the use of a hazardous environment suit. I am your holographic assistant."
Gina Cross' Holographic Assistant counterpart[src]

Sector A, referred to as Sector A Training Facility,[1] is one of the seven main Sectors of the Black Mesa Research Facility.[1] It is connected to the Green Line of the Black Mesa Transit System.[1]

Area 4 Personnel Dormitories[edit]

As seen in the Security Shift Schedule given to Barney Calhoun, Sector A includes the Area 4 Personnel Dormitories.

Two security guards started their Red (from 09:00 to 22:00) and Orange (from 21:00 to 10:00) Shifts in the Area 4 Personnel Dormitories on May 15, 200-.

Training Facility[edit]

The Black Mesa Training Facility, also known as the Hazard Course, is a recurring location featured in Half-Life and its expansions. It is used for training Black Mesa personnel in their duties. It also serves as an in-game training tutorial for the games.


There are additional images in this gallery. Click to expand.

List of appearances[edit]

Main games[edit]



Preceded by
Black Mesa Transit System
Half-Life story arc journey Succeeded by
Black Mesa Transit System
Preceded by
Half-Life: Blue Shift story arc journey Succeeded by
Area 8 Topside Dormitories
Preceded by
Sector C
Half-Life: Decay story arc journey Succeeded by
Satellite Communications Center