This subject is related to the Black Mesa Incident era.
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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. Before the incident, it is restricted and inaccessible to Gordon Freeman. It is connected to a lower canal system through a large lift. The canal leads to an elevator that takes the player to the Administrator Center in Sector D.

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.



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List of appearances[edit]


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