For other uses, see Lambda (disambiguation).
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The Lambda Complex is a large facility dedicated to teleportation research. It becomes one of the most important locations after the incident. The science team in the Lambda is said to be the one who can end the alien invasion. The Lambda logo is used as the symbol for the facility and can be seen on signs and doors.
 Lambda Bunker
Lambda Bunker[a] is the last area before the Lambda Complex. It houses the Black Mesa Central Complex. The sub areas include Loading Bay 3, canals, and the Mechanized Infantry Repair Bay.
A Snark Egg.
 Hazardous Materials Handling Bays
Hazardous Materials Handling Bays A and B serve as storage areas and entrance to the complex. At the time of the incident, Bay B is the last entrance to the Reactor Complex, as all the others have been sealed off to contain the invasion. There is also a Test Firing Chamber, a target range where they test experimental weapons on alien creatures.
 Lambda Reactor Coolant System
Lambda Reactor Coolant System houses Coolant Systems 01 and 02 for maintaining the reactor core at the right temperature. These systems include a Coolant Tank and Pump Station. The player is required to activate the pumps to flood the reactor to reach the upper areas through a maintenance access.
 Lambda Reactor
Lambda Reactor consists of four levels. It houses a large nuclear reactor powering the teleportation labs. There is a large teleporter at the tip of the reactor and is used for sending Survey Teams to the alien world, Xen. The player is supplied and sent to Xen to defeat the Nihilanth from here.
Another side is accessed via a Secured Access of the Lambda Sector Transport, located on level B of the Sector E Materials Transport. There, Adrian Shephard confronts the Black Ops that took hold of the area. One vent found near the tracks directly links to the Level A of Sector F, where Shephard witnesses Freeman's departure to Xen.
 Behind the scenes
As seen in the Half-Life texture files, several unused sign textures suggest that the Black Mesa Central Complex originally contained more areas apparently located before the Lambda Reactor Complex. All their file names bear the prefix "C3A1", used in all three maps covering CenCom Bay 3 area. They are made in the same style as that of the "Black Mesa Central Complex" sign located above the two elevator doors, and include a "CenCom" sign ranging from 1 to 8, accompanied with four arrow signs indicating the left, right, up and down directions, suggesting these areas were to spread on several levels. Another sign, "CenCom Reservoir Access", indicates that the small sewer system located near CenCom Bay 3 was to be indicated by a sign. Finally, the sign "Aero Bays" was also to be found, indicating that a helipad, a hangar or an airstrip was to be located nearby.
 Additional appearances
The map Lambda Bunker takes places in a modified version of CenCom Bay 3.
In this episode, Gordon starts in the Lambda Reactor Complex being under heavy bombardment, 48 hours after the Resonance Cascade occurs. The proper location would rather be outside one of the entrances to the Lambda Reactor Complex, while still being in Sector F.
There Gordon comes across a scientist and a security guard who wish to enter the Lambda Reactor Complex to get down to safety, but they cannot open the door until a signal is sent to the USNRC. However the transmitter to be used to send the signal must be reconfigured manually in the Transmitter Dome located on the surface. Freeman is sent to do it. On his way to the dome, Freeman fights Vortigaunts and HECU soldiers in Hangar 16 (texture reused from Topside Motorpool's Hangar 16), and later sees HECU soldiers executing scientists and cremating dead Vortigaunts. Upon reaching the Transmitter Dome, Freeman tunes the Transmitter to the USNRC after and before fighting more HECU forces, and heads back to the scientist and the security guard by passing through sewers filled with radioactive wasted and Xen creatures. After entering the Lambda Reactor Complex, the three get separated and Freeman is confronted by a Gargantua while the G-Man watches, after which the game ends.
The logos and signs seen in Sector F are very different in style from the other logos and signs seen elsewhere in the facility. That could either mean these levels were among the last to be designed, or that Sector F is one of the most recent sectors of Black Mesa (as one of the fonts is also used in the rather recent Biodome Complex). The particular font used for the large letters is Eurostile; the one used for the small letters is Helvetica LT Condensed Black.
 List of appearances
 Main games
- Half-Life (First appearance)
- Half-Life: Opposing Force
- Half-Life: Blue Shift (Black Mesa Transit System map only)
- Half-Life: Decay (Mentioned only)
Waste Processing Area 3
|Half-Life story arc journey||Succeeded by|
Sector E Materials Transport
|Half-Life: Opposing Force story arc journey||Succeeded by|