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The Combine Security Door is a type of door used by the Combine to block the three original Overwatch Nexus doors door during the Uprising.


The Dropgate is simply a large chunk of Combine metal that instantly drops on command along two large rails, in a manner similar to that of a guillotine. It is unknown how the Combine actually make it drop, as there seems to be no switch to do so.

Behind the scenes[]

The three doors are brushes using the entity "func_door", named "atrium_securitydoors", hence the name.

List of appearances[]

See also[]