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Force Fields, often attached to Combine Interfaces, prevent any living thing that is not recognized from passing through them. They are used prolifically by the Combine to control Citizen movements and prevent unauthorized access to areas that are out-of-bounds.


The Force Field consists of two generators, each one on either side of the path it is intended to protect. Invisible from a distance, the force field preventing entry is generated between the two pylons. When an unregistered individual attempts to go through it, it will emit a humming sound when in physical contact. However, other than vehicles driven by non-recognized personnel, the system will not block inanimate objects. Some of them are seen in-game being powered off standard human power supply sockets, Combine Power Generators, or from APC batteries. They are placed at regular intervals along railway tracks in City 17. Force fields can also be found along the Coast, in the Citadel, in the Outlands, or any Combine-controlled area.

It is worth noting that while the player is merely stopped from moving into a force field, going closer will actually cause a discharge (as seen in the Half-Life 2 chapter Entanglement where Alyx attempts futilely to stop Judith Mossman making off with Eli Vance). In fact, being caught inside a force field when it is activated will result in instant death.


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