Editing Energy barrier

{{Status|Canon}}
{{Center|Were you looking for [[Shield door]]s?}}
[[File:Energy_barrier.jpg|thumb|250px|An energy barrier in the hangar bay of a [[Covenant corvette]].]]
'''Energy barriers''', sometimes referred to as '''energy fields''', are a type of visible energy field used to separate a pressurized environment from the vacuum of space.<ref>'''Halo: Contact Harvest''', ''page 98''</ref><ref>'''Halo: Contact Harvest''', ''page 309''</ref> Energy barriers are useful because they allow solid matter through, but not gases, such as [[oxygen]] and neon. However, before matter passes through, the pressure on both sides must be equalized, to minimize the risk of explosive decompression.

The Covenant use energy barriers as hangar doors, in [[airlock]]s and for [[Naval boarding|boarding parties]] to board enemy ships. Energy barriers are present on [[R'sisho-pattern Tick]], on the end of the craft's penetration tip.<ref>'''Halo 2''', level ''[[Cairo Station]]''</ref> Energy barriers are also used as exterior doors in [[hangar bay]]s on Covenant starships.<ref name = "Truth and Reconciliation">'''Halo: Combat Evolved''', campaign level, ''[[The Truth and Reconciliation]]''</ref> The barriers can also be configured to block all vehicles or personnel or allow them to pass through when required.<ref>'''Halo: Reach''', campaign level, ''[[Long Night of Solace (level)|Long Night of Solace]]''</ref> It is interesting to note that [[Covenant]] [[signal unit]]s work through Covenant energy barriers, while human [[COM]] units do not.<ref name="ch99">'''Halo: Contact Harvest''', ''page 99''</ref><ref>'''Halo: Contact Harvest''', ''page 132''</ref>

Before the [[Human-Covenant War]], the [[UNSC]] had begun to experiment with energy barriers. After reverse-engineering Covenant technology, the UNSC was able to easily produce and deploy energy barriers.<ref>[https://blogs.halowaypoint.com/en-us/blogs/headlines/posts/the-halo-bulletin-5-14-14 '''Halo Waypoint''': ''The Halo Bulletin 5.14.14'']</ref> By [[2546]], the UNSC had begun to employ energy barrier technology in their space installations and ships in a fashion similar to the Covenant. Examples of human energy barriers include: hangar bay doors on the ''[[Argent Moon]]'',<ref>'''[[Halo 5: Guardians]]''', campaign level, ''[[Blue Team (level)|Blue Team]]''</ref> the hangar bay doors on the Sabre engineering facility on the [[Refit station|orbital dockyard]] ''[[Anchor 9]]'',<ref>'''Halo: Reach''', multiplayer map, ''[[Anchor 9 (map)|Anchor 9]]''</ref> and the windows of the {{Class|Charon|light frigate}} {{UNSCShip|Forward Unto Dawn}}.<ref>'''Halo 4''', campaign level ''[[Dawn]]''</ref> As the most advanced warship in the [[UNSC Navy|Fleet]], the hangar bays of the {{UNSCShip|Infinity}} are also equipped with energy barriers.<ref>'''Spartan Ops''': [[S1/Exodus|S1E10 ''Exodus'']]</ref>

Other energy barriers are used for security purposes. Covenant [[holding chamber|prison cells]], such as those found in the ''[[Truth and Reconciliation]]''{{'}}s brig, utilized energy barriers that stopped all solid matter from passing through.{{Ref/Reuse|Truth and Reconciliation}} 

During the [[Battle for Zeta Halo]], the [[Banished]] used energy barriers for a variety of purposes, often in lieu of physical windows.{{Ref/Quest|Id=Excavation Site|HI|Connections|Excavation Site}} 

==Gameplay==
In the ''Halo'' games, energy barriers are typically encountered in levels featuring a Covenant ship. 

In ''[[Halo: Combat Evolved]]'', it is possible to operate the shuttle bay doors of the ''[[Truth and Reconciliation]]''. On the level [[The Truth and Reconciliation]], the player is able to access the doors by heading to the third floor of the shuttle bay and pressing '''X''' on the control panel. This is required to complete the mission, so the player can escape in a [[Taaku Xur-pattern Spirit|Spirit]] with [[Jacob Keyes|Keyes]].

In ''[[Halo: Reach]]'', on the [[Covenant corvette]] ''[[Ardent Prayer]]'' in the level ''[[Long Night of Solace (level)|Long Night of Solace]]'', the shields operate differently: after [[SPARTAN-B312|Noble Six]] presses a button, the shields still remain in place over the bay, but ships can now go in and out of them. Presumably they are simply lowered to a point things could travel through them while remaining in place to hold the atmosphere in the bay as the ship is in space.<ref>'''Halo: Reach''', campaign level ''[[Long Night of Solace (level)|Long Night of Solace]]''</ref>

==Gallery==
<gallery>
File:H5G-Open Energy Barrier.png|An open human energy barrier on ''[[Argent Moon]]''.
File:H5G-Closed Energy Barrier.png|The same energy barrier closed.
File:HTMCC-HCEA CCS Holding Chamber.jpg|Another type of energy barrier used by the Covenant to contain prisoners in holding cells.
File:HINF Infinity energy barrier.png|John-117 gets thrown through the ''Infinity''{{'}}s energy barrier.
File:HINF Ghost of Gbraakon Hangar Energy Barrier.png|An energy barrier covering one of the ''[[Ghost of Gbraakon]]''{{'}}s hangar bays.
File:HINF Site Novem Laser Controls.png|An energy barrier next to the controls for the [[Banished]] mining laser at [[Site Novem]].
File:HINF Tremonius Energy Barrier.png|[[Tremonius]] standing in front of an energy barrier while facing off against [[John-117]] underneath [[Outpost Tremonius]].
File:HINF Riven Gate Energy Barrier Banshee.png|An energy barrier over a Banshee hangar at [[Riven Gate (location)|Riven Gate]].
</gallery>

==List of appearances==
*''[[Halo: Combat Evolved]]'' {{1st}}
*''[[Halo: First Strike]]''
*''[[Halo 2]]''
*''[[Halo 3]]''
*''[[Halo: Contact Harvest]]''
*''[[Halo Legends]]''
**''[[The Package (animated short)|The Package]]''
*''[[Halo: Reach]]''
*''[[Halo: Combat Evolved Anniversary]]''
*''[[Halo 4]]''
**''[[Spartan Ops]]''
*''[[Halo 2: Anniversary]]''
*''[[Hunt the Truth]]''
*''[[Halo 5: Guardians]]''
*''[[Halo: Tales from Slipspace]]
**''[[Hunting Party]]''
*''[[Halo: Envoy]]''
*''[[Halo: Retribution]]''
*''[[Halo Infinite]]''
*''[[Halo: Epitaph]]''
*''[[Halo: Age of Retribution]]''

==Sources==
{{Ref/Sources}}

[[Category:Security technology]]
[[Category:Shield technology]]