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[[File:OxygenCircle.png]] Oxygen (Life Support in advanced edition) is a key element on most ships. All crew members require oxygen to prevent suffocation, except [[drones]] and [[Races/Crew#Lanius|Lanius]].[[File:Aixqps8.jpg|thumb|Kruos (Lanius Cruiser A) void of oxygen]]
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[[File:OxygenCircle.png]] Oxygen (Life Support in advanced edition) is a key element on most ships. All crew members (except [[drones]] and [[Races/Crew#Lanius|Lanius]]) require oxygen to prevent suffocation.[[File:Aixqps8.jpg|thumb|Kruos (Lanius Cruiser A) void of oxygen]]
   
 
A room's oxygen level decreases when:
 
A room's oxygen level decreases when:
 
*it contains a breach, [[Fires|fire]], or Lanius.
 
*it contains a breach, [[Fires|fire]], or Lanius.
*has a door open to space or another room with lower oxygen.
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*has a door open to space or another room without full oxygen.
 
*the Oxygen/Life Support system is unpowered or hacked.
 
*the Oxygen/Life Support system is unpowered or hacked.
 
The color of the room indicates its oxygen level -- white indicates maximum oxygen, red/pink indicates lower oxygen, and red lines across the room indicate suffocation danger at 5% oxygen or lower. The Oxygen/Life Support [[Systems|System]] replenishes and maintains the ship's oxygen, with higher levels speeding up the recovery process and even negating the loss from a hull breach. If the Oxygen/Life Support System is unpowered, the ship's oxygen levels will drop by about 1% every second.
   
 
Deliberately deoxygenating rooms has a few uses. Fires in red hatched rooms will be extinguished after a short time, and boarders can be killed by venting rooms, although this technique is unreliable if the [[Doors]] [[Systems|Subsystem]] is not sufficiently upgraded.
The color of the room indicates its oxygen level -- white indicates maximum oxygen, red/pink indicates lower oxygen, and red lines across the room indicate suffocation danger at 5% oxygen or lower. Suffocating Crewmembers take 6.4 damage per second. The Oxygen/Life Support [[Systems|System]] replenishes and maintains the ship's oxygen, with higher levels speeding up the recovery process and even negating the loss from a hull breach.
 
If the O2 System is unpowered, the ship's oxygen levels will drop by 1.2% every second. Level 1 O2 replenishes oxygen at the same rate.
 
   
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Note that certain ships, in particular some [[Slug]] ships, have the Oxygen/Life Support system inaccessible to crew (and therefore irreparable), which presents a great opportunity to destroy the system and leave them to suffocate in order to obtain higher rewards.
Deliberately deoxygenating rooms has a few uses. Fires in red hatched rooms will be extinguished after a short time, and boarders can be killed by venting rooms, although this technique is unreliable if the [[Doors]] [[Systems|Subsystem]] is not sufficiently upgraded. However, even in cases where boarders cannot be trapped and suffocated, they will attempt to move out of oxygen deprived rooms to reach rooms with oxygen. This allows the player to control boarders' movement and prevent them from damaging certain systems or funneling them into rooms such as the [[Medbay]] after setting up an ambush with crew.
 
   
All [[Enemy Ships#AI-Controlled_Rebel_Ships|Automated Ships]] and [[Enemy Ships#Lanius Ships|Lanius Ships]] have completely vented rooms, meaning that fire-based weapons will be largely useless, and boarding is hazardous (except for Lanius crew).
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All [[Enemy Ships#AI-Controlled_Rebel_Ships|Automatic Ships]] and [[Enemy Ships#Lanius Ships|Lanius Ships]] have completely vented rooms, meaning that fire-based weapons will be largely useless if the fire cannot be maintained enough to damage the system. Oxygen dependent boarding parties will also find it difficult to damage systems before suffocating.
 
==Notes==
 
==Notes==
 
*A level 1 Medbay will protect crew from suffocation if the ship is completely vented, but it will not regenerate their health. Upgrades to the Medbay can help them recover.
 
*A level 1 Medbay will protect crew from suffocation if the ship is completely vented, but it will not regenerate their health. Upgrades to the Medbay can help them recover.
 
*If a room is totally vented, opening a nearby un-vented room will speed up oxygen recovery.
 
*If a room is totally vented, opening a nearby un-vented room will speed up oxygen recovery.
*The [[Crystal]] race takes half damage from lack of oxygen.
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*The [[Crystal]] race takes considerably less damage from lack of oxygen.
 
* The [[Lanius]] race deplete oxygen where they are and takes no damage from lack of oxygen.
 
* The [[Lanius]] race deplete oxygen where they are and takes no damage from lack of oxygen.
* Level 2 O2 can significantly delay oxygen loss caused by breach and Lanius crew.
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* Improved Life Support System can significantly delay oxygen loss caused by breach and Lanius crew.
* Level 3 O2 can even fill oxygen up in fully vented room which has breach or Lanius Crew, although it takes a while.
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* Advanced Life Support System can even fill oxygen up in fully vented room which has breach or Lanius Crew, although it takes a while.
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* Providing full power to upgraded Life Support System is very useful when your ship is boarded by a party with Lanius, Boarding Drones, and Ion Intruders.
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* Improved Life Support is paradoxically rather useful when you wish to save power by ''not'' powering Life Support. You can keep the power off for most of the battle, and only refill during a cloak or when it's safer. This can be done with a Level 1 Life Support as well, but the slower oxygen refill rate creates a somewhat larger risk, and required the system will need to be kept on longer to refill, in some cases even after the battle is over.
 
[[Category:Systems]]
 
[[Category:Systems]]

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