Door

Doors are movable barriers used to cover up openings; typically, such barriers are attached to the very openings they block. They are used by virtually all factions in the Halo universe.

Appearances
Below is a list of the various door shapes and colors seen in the Halo games. Doors are listed for Halo: Combat Evolved, Halo 2, Halo 3 and Halo 3: ODST. Doors are not listed for Halo Wars, nor are they listed for the currently-unreleased Halo: Reach.

Halo: Combat Evolved

 * Pillar of Autumn:
 * Two types of sliding doors.
 * Blast Doors.
 * Metal grate-covered maintenance shaft doors.
 * Lifeboat Airlock doors.


 * Halo: N/A


 * The Truth and Reconciliation:
 * Two different sizes of two-part Covenant sliding doors.
 * Shuttle bay doors.


 * The Silent Cartographer:
 * Triangular, tri-segmented Forerunner doors.


 * Assault on the Control Room:
 * Triangular, tri-segmented Forerunner doors.
 * Larger versions of the tri-segmented Forerunner door. (Generally leading outside, or in more important areas)
 * Large blast doors in the underground tunnels.
 * Large multi-part Control Room doors.


 * 343 Guilty Spark:
 * Triangular, tri-segmented Forerunner doors.


 * The Library:
 * Massive Forerunner security doors.
 * Several smaller types of doors.


 * Two Betrayals:
 * Triangular, tri-segmented Forerunner doors.
 * Larger versions of the tri-segmented Forerunner door. (Generally leading outside, or in more important areas)
 * Large blast doors in the underground tunnels.
 * Large multi-part Control Room doors.


 * Keyes:
 * Two different sizes of two-part Covenant sliding doors.
 * Shuttle bay doors.


 * The Maw:
 * Two types of sliding doors.
 * Blast Doors.
 * Metal grate-covered maintenance shaft doors.
 * Lifeboat Airlock doors.
 * Static tri-segmented vehicle doors (in the tunnels of the final run).

Halo 2

 * Cairo Station:
 * High-tech automatic doors, with a light indicating their locked/unlocked status.
 * Different types of Blast Doors.
 * Thick metal doors (In the tramway)
 * Glass-plated doors.


 * Outskirts:
 * Impassable gray doors with yellow upside down triangles (In the buildings of Old Mombasa).
 * Dark green metal doors in the rooms of Hotel Zanzibar.
 * Large highway doors (In the highway tunnel).
 * Corrugated metal doors (In the highway tunnel).
 * Several types of un-passable service doors (In the higway tunnel and Old Mombasa).


 * Metropolis:
 * Large highway doors (In the highway tunnel).
 * Corrugated metal doors (In the highway tunnel).
 * Several types of un-passable service doors (In the higway tunnel and the streets of New Mombasa).
 * Two-part sliding doors with glass windows, in the Mtangulizi Kampuni building.


 * The Arbiter:
 * Rectangular Forerunner airlock doors with a blue square in the middle.
 * Normal Forerunner doors.
 * Large main doors of the Gas Mine's hangar.


 * The Oracle:
 * Rectangular Forerunner airlock doors with a blue square in the middle.
 * Normal Forerunner doors.
 * Large main doors of the Gas Mine's hangar.


 * Delta Halo:
 * Forerunner doors covered in ornate carvings, with an oval eye-like symbol in the center.


 * Regret:
 * Forerunner doors covered in ornate carvings, with an oval eye-like symbol in the center.


 * Sacred Icon:
 * Forerunner Pistons.
 * Large Forerunner vehicle doors containing multiple segments which spin 90° and retract upwards.


 * Quarantine Zone:
 * Large Forerunner vehicle doors containing multiple segments which spin 90° and retract upwards.
 * Normal forerunner doors.
 * Massive, circular doors with multiple segments.


 * Gravemind:
 * Multi-layered Covenant doors.
 * Covenant prison cage doors.


 * Uprising (level):
 * Triangular Forerunner doors with two segments.


 * High Charity:
 * Multi-layered Covenant doors.


 * The Great Journey:
 * Triangular Forerunner doors with two segments.

Halo 3

 * Sierra 117: N/A
 * Crow's Nest:
 * Heavy bunker-style doors, which are opened with door control buttons, remarked by a Marine as being "old tech", as the base was built in the 21st century.
 * Large vehicle doors (Static).
 * Elevator doors.


 * Tsavo Highway:
 * Large bunker doors of Crow's Nest
 * Highway tunnel doors.
 * The Storm:
 * Person-sized industrial automatic doors.
 * Industrial vehicle doors, openable with a button.
 * Large vehicle doors.


 * Floodgate:
 * Person-sized industrial automatic doors.
 * Industrial vehicle doors, openable with a button.
 * Large vehicle doors.


 * The Ark:
 * Triangular, tri-segmented Forerunner doors.
 * Multi-part doors with segments that open upward (In the wall structure).


 * The Covenant:
 * Triangular, tri-segmented Forerunner doors.
 * Multi-part doors with segments that open upward (In the tunnel that leads to the Citadel).
 * Forerunner Control Room doors (In the Citadel).
 * Cortana:
 * Flood Portas: Large, sphincter-like orifices.
 * High Charity's multi-segmented Covenant doors with a spinning lock in the center.


 * Halo:
 * Triangular, tri-segmented Forerunner doors.
 * Forerunner Control Room doors (In Control Room).

Halo 3: ODST

 * Prepare To Drop
 * One set of a UNSC ship's sliding doors with hazard stripe pattern in the middle section.


 * Mombasa Streets
 * New Mombasa's sector-dividing street gates.
 * Security doors.
 * Standard building doors.


 * Tayari Plaza
 * New Mombasa's sector-dividing street gates.
 * Standard building doors.


 * Uplift Reserve: N/A


 * Kizingo Boulevard
 * New Mombasa's sector-dividing street gates.


 * ONI Alpha Site
 * Security doors of the ONI Alpha Site.


 * NMPD HQ
 * Double-layered sliding metal doors, with status indicator lights.


 * Kikowani Station
 * Massive metal doors, dividing the sections of the Kikowani district.


 * Data Hive
 * Various types of metal security doors of the Data Center.


 * Coastal Highway
 * Large highway blocking gates.

Discussion
Like all technology created by the various factions of the Halo Universe, the doors they create for various purposes represent their general design styles in many ways. The Covenant frequently use curves as well as bright purples, blues, and grays in the design of their technology; everything from weapons to cities. The doors incorporate the curves and colors standard to Covenant design, most notably in High Charity. While many doors throughout the halo universe have indicator lights and work by sliding in and out of the walls, only the doors in High Charity that flash when the player gets close and emit a tone.

Human technology for doors has progressed since the modern era. While most doors today are based on a hinge system, the doors seen on Earth are exclusively sliding, either opened by proximity or a switch located on the door itself. Like most human technology applied to everything from roads to space faring military vessels, the design is simple and geometric (with some discrepancies) with straight lines and angles, and involves blacks, grays, and browns. Most doors have a light on them that is either green to indicate that it is open or can be opened, or red to indicate that it is locked.

Doors built by the Forerunners are completely geometric and incorporate the similar light grays, browns, and blues of the rest of their technology. The doors themselves are geometric and often slide in multiple parts. They also have complex and geometric designs on them, it is often patterned. This same trend can be seen on floors of Forerunner structures.

Doors built by the Flood have only been observed during the level Cortan. While the Flood do not have what we consider conventional architecture, they build their structures out of biomass they have consumed. Their doors, called Portas, are built from biomass of infected hosts, and resemble valves like those in the heart. They open based on proximity. While the sections of the door itself retract, the circular frame of the door contracts at the same time, this effect was most likely added by Bungie to make the player feel as if they were playing inside a living thing during the level, and add effect to the level.

Trivia

 * The object John-117 rode to Earth in the beginning of Halo 3, is apparently some sort of Forerunner door, part of the Forerunner Dreadnought.
 * The triangular, tri-segmented Forerunner door is the most commonly seen door model in the Halo trilogy.

Related Pages

 * Shield Door
 * Blast Door
 * Shuttle bay door
 * Porta
 * Piston