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The Black Mesa Ceiling Turret is an automatic sentry gun built into the ceiling and deployed when any organic matter is detected in front of it. They are found in heavily secured storage areas around the facility for protection against any intruders or other threats. However this proves futile during the invasion due to the fact that they pick up on all life forms, human and alien, making them a great help and a massive threat.
- Ceiling Turrets are seen in several places within the Black Mesa Research Facility, concealed within the ceiling in an armored cupola. Some are activated or deactivated by a switch, some deploy automatically. When a switch is available, the player can always use it. If not, the Turret can be disabled with explosives or gunfire.
- The Ceiling Turrets do not distinguish friends from foes. Therefore, they will attack anything in range, including all Black Mesa employees as well as Xen creatures.
- The Ceiling Turrets were set possibly to deal with potential escaped specimens, or are perhaps a leftover from the facility's days as a military missile complex.
- In Decay, Rosenberg simply refers to them as "sentry guns".
- The Ceiling Turret comes in two variants: a three barreled gun and a smaller single barreled gun.
Though the ceiling turret fits the description of a regular enemy, being moderate damage and easy to kill they only make three appearances throughout the game. The first two appearing in the storage rooms in the chapter Office Complex, posing as obstacles for the player to avoid, destroy, or shut off. They later appear in the Lambda Complex storage facility, in the beginning of Forget About Freeman!, this time working as more of an ally because, unlike most turrets, the switch is right there when the player comes in and is already turned off, giving them the option to turn it on and kill the army of Vortigaunts and Grunts in the room. There are also two turrets in the final room of the Hazard Course; however, these turrets are only deployed upon friendly fire onto either the scientist or the Security guard in the room.
- The turret goes into standby and retracts into its cupola if there are no targets in range. However they deploy again if anything comes into range.
- In Half-Life, the firing sound of the single barrel variant is similar to the sound of the HECU Sentry Gun and the MP5, while in Half-Life: Source, it is shared with the firing sound of the tri-barrel variant.
- The single barrel version of these turrets can be seen in Counter-Strike: Condition Zero Deleted Scenes's mission Thin Ice.
- In the Source version, the turrets in the Hazard Course cannot be destroyed.
- Critical damage will cause them to malfunction. This means they will shoot in all directions before exploding.