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Sector B

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C1a1c canal02.jpg
Sector B
General information

200-, during the Black Mesa Incident


Black Mesa Research Facility


Black Mesa Incident


Black Mesa

"Hey, you got the wrong airlock, Mr. Freeman. You know I can't let you through here."
Black Mesa security guard[src]

Sector B,[1] referred to as Sector B Coolant Reserve,[2] is one of the seven main Sectors of the Black Mesa Research Facility.[2] It is connected to the Blue Line of the Black Mesa Transit System.

Coolant Reservoir Facility[edit]

This location is a maintenance area for the coolant facility consisting of halls and rooms with metal walls, and featuring a small system of drainage tunnels. Before the incident, the double doors connecting Sector C to the area are guarded by a security guard, making the location restricted and inaccessible to Gordon Freeman. It is connected to a lower canal system through a large lift.

The canal is crossed by a footbridge that leads to a large elevator going up to the Administrator Center in Sector D, but it has collapsed following the Resonance Cascade. To cross the canal, several maintenance areas and labyrinthine corridors must be traversed from maintenance doors at the canal level, as well as a large and deep room featuring a track system for crate transportation, not in function during Freeman's visit.

Area 2 Administration Offices[edit]

As seen in the Security Shift Schedule given to Barney Calhoun, Sector B features an Area 2 Administration Offices. Two security guards started their Yellow (from 09:00 to 22:00) and Green (from 21:00 to 10:00) Shifts there on May 15, 200-.[3]

Sector B Line[edit]

A medium-security line on the Black Mesa Transit System that is connected to the Area 9 Security Checkpoint.




List of appearances[edit]


Preceded by
Sector C
Half-Life story arc journey Succeeded by
Sector D