Door System

Door System room (console on the right)

Doors control panel

Allows opening and closing of doors and airlocks.

Overview

• Functioning Door System allows operating (opening and closing) doors by the player. This has many uses:
  • Venting oxygen from a room to suffocate fires.
  • Equalizing oxygen levels between rooms.
  • Assisting in dealing with boarders. Boarders can be separated, stalled, or manipulated to change their direction and effectively suffocated. (requires level 2+ Door System)
• Disabled, broken or lack of the Door System - indicated by the doors having a red-orange color - prevents doors operations by the player (including using the "open/close all doors on the ship" GUI Door System buttons) of all doors and vents. Crew, drones, and boarders can freely move through such doors. Crew/drones presence in a room does not affect the player capability to open/close doors or vents.
  • Ionizing effect completely disables operation of the Door System, regardless of the system level and the ion damage amount. Zoltans cannot ion-proof the Door System (or any other subsystems).
• Blast doors (level 2+ doors system) impede intruders movement.
• Closed doors with available Door System slow down fires spreading between rooms.
  • Blast doors significantly slow down the fires spreading to other rooms.
• Hacked doors are equivalent to opened doors (or lack of the Doors System).
  • Boarders move freely through hacked doors.
  • Fires spread at the fastest pace from such rooms to other rooms.
• Doors can be opened in specific patterns to slow down the oxygen loss in the room (and in the other connected rooms with opened doors) due to hull breaches/Lanius. Open only one door in a breached room and make the longest possible corridor of opened rooms with oxygen leading to the breached room, keep the O₂ system functioning for best results.
  • With this technique level 2 O₂ system is capable of countering multiple breaches.
  • The technique's ultimate effectiveness is, however, subject to the actual ship layout and, to some extent, the breach location.
• Replenishing oxygen in vented rooms can occur faster by opening as many rooms with higher oxygen levels as possible (when there are no breaches/Lanius).
• To vent a specific room on a ship in the fastest possible way, open all available airlocks or rooms with breaches/Lanius that lead to the room that needs venting. Turn off the O₂ system to quicken the process.
• Manning the Door System console makes the system work 1 level above its current upgrade level.
  • The maximum (4th) system level can be achieved only by manning the system.
• Door strength depends on the Door System level and the game difficulty. (see the door strength table)
• Having boarders or fires on your ship, when playing on Hard difficulty, puts Door System on the enemy high-priority system targeting list. (see more details here and here)
• Upgraded Door System can be used as a blue option in some events.
• Can be upgraded in Specialty work on your ship event.
• [bugged] Under certain circumstances the enemy crew can move through your unbroken blast doors, both on your ship and their ship (when their system is hacked)

Door strength

Fires spread effortlessly through open doors. Blast Doors substantially impede fire spread. Closed doors slow down the spread of fire by 1.75 times and closed Blast Doors slow down the spread of fire by 10 times, compared to hacked or opened doors or no Door System.

Enemy boarders will break down blast doors. They make about one attack per second with slightly randomized timing. Doors have a set amount of health which is restored after making an FTL jump. When broken, a door remains stuck open for 7 seconds, after which its health is reset and you can control it again (you can issue the "Close All Doors" command - the default keyboard shortcut is set to "X" - to force the door to close automatically as soon as it becomes operable). Broken doors on enemy ships always stay open, except for when a breach occurs in the room and also when a breach gets sealed (the doors system must be functional).

When the Door System is actively hacked, all doors temporarily become enemy level 3 (improved blast) doors; the doors health is reset with each hack cycle (this doesn't apply to the doors of the hacked Door System).

Lockdown effect of the Crystal crew special power ability and Crystal Lockdown Bomb restores the doors health and also protects it while the crystal coating lasts. While a room is on lockdown, it is impossible to manually open or close the doors (this doesn't apply to the airlocks which always stay operational). Nevertheless, it is possible to override this limitation by issuing the "Open All Doors" command - the default keyboard shortcut is set to "Z" - to open all doors and then manually close the ones that need to be closed (the command to "Close All Doors" is set to the keyboard shortcut "X" by default). Note that if a room is locked down before a hacking drone attaches to the system, then the room's doors take only 4 hits to be broken after the coating disappears (instead of the regular 10 hits on Hard difficulty), but another lockdown will reset the doors health appropriately (and also protect their health while the coating lasts); however, if a hacking drone attaches to the system and the disruption pulse is activated, then the doors retain their normal strength after the crystal coating disappears.

The number of hits required to break down doors varies by the system level and the difficulty setting. Both the player and the enemy doors are weaker on higher difficulties.

Hits required to break a door
System level	Game difficulty setting
	Hard	Normal	Easy
2	6	8	12
3	10	12	16
4	15	18	20

If the Door System level changes while a door is being attacked, the dealt damage is remembered and the current maximum and the leftover door strength changes proportionally (e.g. on Hard difficulty level 3 provides 66% door strength increase over level 2). Some examples on Hard difficulty:

• Level 2 doors already hit 5 times will require only 1 hit to be broken if the Door system level is increased by manning
• Level 2 doors already hit 4 times will require 3 hits to be broken if the Door system level is increased by manning
• Level 3 doors already hit 6 times will still require 1 hit if the Door system level is decreased to level 2

System Upgrades

Level	Cost	Doors	Effect
1	60*	Normal Doors	Remote opening/closing of doors
2	35	Blast Doors	Significantly slows down fires spread between rooms, impedes boarders movement
3	50	Improved Blast Doors	Significantly slows down fires spread between rooms, impedes boarders movement more
4	N/A**	Super Blast Doors	Significantly slows down fires spread between rooms, impedes boarders movement even more

* Only the Rock Cruiser layout B (Shivan) does not have the Door System pre-installed.
** Only available when level 3 Door System is manned.

Tips & guides

• Doors, fires and venting (on Mantis B).