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This page details the events depicted in ''[[Subnautica]]'' in which they are presumed to be in the correct canonical order. Some players might encounter the events in a different order, but the general story is still unaffected. All information is taken from in-game lore, and Developer statements.in order
This page details the events depicted in ''[[Subnautica]]'' and ''[[Subnautica: Below Zero]]'' in what is presumed to be the correct canonical order. Some players might encounter the events in a different order, but the general story is still unaffected. All information is taken from in-game lore and developer statements.


==Pre-''Subnautica''==
=Base Game Story Events=
*At some point, dolphins on Earth become extinct.<ref name="dolphins">[[Databank (Subnautica)#Cuddlefish|Databank Entry: Cuddlefish]]</ref>
===Precursor Period Events===
*[[Alterra Corporation]] begins as a defense manufacturer startup in the mid-22nd century.
*Around 1000 years prior to the events of the game, the [[Precursor Race]] discovers [[Kharaa Bacterium|Kharaa]] on an unknown planet and some individuals are infected. Errors in quarantine procedures cause Kharaa to be spread to their core worlds.
**Somewhere down the line, Alterra is recognized as a trans-gov; fulfilling the role as the TSF's official supplier, as well as one of the largest technology suppliers for the federation.
*The Precursors set up several research outposts to attempt to develop a vaccine, including one on [[Planet 4546B]]. The [[Quarantine Enforcement Platform]], the [[Disease Research Facility]], and the [[Alien Thermal Plant]] are constructed, as well as the [[Sanctuary Caches]]. It can be assumed that around this time period, the [[Gargantuan Fossil]] was found, and the Precursors began taking samples from its ribcage.
**Heavily influenced by Alterra's threats to cut weapon supplies, the warring factions end hostilities during the Expansion and sign the Charter.<ref>[[Databank (Subnautica)#Trans-Gov Profile:Alterra Corp.|Trans-Gov Profile: Alterra Corp]]</ref>.
*After many tests, the [[Sea Emperor Leviathan]] species is found to have an immunity to Kharaa, and the [[Primary Containment Facility]] is constructed, along with the [[Alien Arch Caches]] in various biomes. The Precursors capture a 1600-year-old Sea Emperor Leviathan, along with its seven eggs, and contain them within the facility. It is likely that this is also when the [[Ancient Skeleton]] was discovered, and the [[Lost River Laboratory Cache]] was constructed as the focus of this laboratory's study is Leviathans.
===Architect period===
*It is revealed to the Precursors that their captive is much too old. Due to this, the potency of its Enzyme 42 had declined, meaning it was not capable of killing the infection, only causing temporary remission. The Precursors then conclude to research its unborn eggs, as they deduced that a younger specimen would produce a stronger enzyme.
*The [[Architects]] discover the [[Kharaa Bacterium]] on an outer planet during a routine network expansion. A network error caused the Architects' routine quarantine procedure to fail, resulting in at least 143 billion deaths on their core worlds. The Architects quarantined their core worlds and brought Kharaa to isolated disease research facilities, including on [[Planet 4546B]], in order to research and develop a [[Enzyme 42|cure]].<ref name="contagion">[[Databank (Subnautica)#Kharaa Contagion Profile|Databank Entry: Kharaa Contagion Profile]]</ref> The Architects construct the [[Quarantine Enforcement Platform]], [[Disease Research Facility]], [[Alien Thermal Plant]], and [[Sanctuary Caches]] and began constructing [[Warper]]s (whether this was the first time Warpers were constructed is unknown). It is believed the Architects also discovered the [[Gargantuan Fossil]] around this time and began to take samples from its rib cage.
*The Sea Emperor Leviathan telepathically telling the Precursors their methods of forcefully making the eggs hatch would not work though according to the Sea Emperor "they could not hear". The Precursors dissect one of the eggs and lay its fetus on an operating table, however, the process kills the fetus. A second egg is stored within the Primary Containment Facility's egg lab in order to research it. More eggs from the majority of the species on the planet are taken as well. The Precursors eventually place the remaining five eggs into the [[Incubator Device]].
*A meteorite strikes 4546B in the [[Dunes]] biome. The resulting crater blocks the entrance to the Architect cache and the impact toppled one of the cache's pillars.
*The Precursors take a [[Sea Dragon Leviathan]] egg for research on leviathan egg hatching conditions, due to the species' possible relation to each other. However, the parent tracks down its egg and rams into the Disease Research Facility, destroying it. Kharaa is released and the Precursors initiate the planetary quarantine. Construction for the Warpers ceases, leaving only a limited number on the planet.
*The Architects discover the [[Sea Emperor Leviathan]] species produces [[Enzyme 42]], a complex compound that provides immunity to Kharaa. They construct the [[Primary Containment Facility]] and [[Alien Arch Caches]]. They also capture a 1600-year-old Sea Emperor Leviathan and her seven eggs and place them in the Primary Containment Facility. It is believed the Architects also discovered the [[Ancient Skeleton]] and constructed the [[Lost River Laboratory Cache]] around this time.
*The Precursors deem the planet a lost cause due to Kharaa's severity, focusing on a vaccine rather than the spread of the bacterium.<ref>https://imgur.com/a/3sM0x</ref> Kharaa kills a majority of species on the planet, rendering the ancestors of the creatures in the modern day to rapidly evolve due to the drastic changes in the ecosystem.
*The Architects place various relics from other alien races, including humankind, in the Primary Containment Facility.
*Remaining Precursors are evacuated to sanctuaries where their bodies are disposed of and their minds uploaded to data hubs.
*After testing the living Sea Emperor Leviathan, the Architects discover she is too old to produce Enzyme 42 potent enough to work as a permanent cure. Instead, the Architects research the unborn eggs on the premise that a younger specimen would produce stronger enzymes. The Sea Emperor Leviathan attempts to telepathically communicate to the Architects that forcefully hatching the eggs would not work, but, according to her, "they could not hear."
*The Sea Emperor Leviathan species is killed off due to their food source being wiped out by Kharaa, save for the one in containment.
*The Architects dissect a Sea Emperor Leviathan egg to study the fetus, but the process killed the fetus. They place a second egg and more eggs from other species on the planet in the Primary Containment Facility's egg lab for further research. The Architects place the remaining five Sea Emperor Leviathan eggs into the [[Incubator Device]].
*The Sea Emperor Leviathan trains [[Peeper]]s to use the [[Alien Vents]], with each Peeper carrying small amounts of Enzyme 42 to distribute among the planet.
*The Architects take a [[Sea Dragon Leviathan]] egg to the Disease Research Facility to study [[Leviathan Class Organisms|Leviathan Class]] egg hatching conditions. The parent Sea Dragon tracks down the egg and rams into the facility, destroying the facility but killing the Sea Dragon shortly afterward. The facility's destruction causes the release of Kharaa on the planet; the Architects subsequently initiate a planetary quarantine, activating the [[Quarantine Enforcement Platform]] and ceasing construction of further Warpers.
*The Precursor species is presumably killed off by Kharaa sometime between 1200 AD and 2160 AD.
*Kharaa kills a majority of species on the planet, forcing the ancestors of the modern-day species to rapidly evolve to match the drastic changes in the ecosystem. The Sea Emperor Leviathan species is killed off due to their food source being wiped out by Kharaa, except for the last remaining specimen and her eggs in the Primary Containment Facility.
*The remaining Architects evacuate to the sanctuary caches, disposing of their bodies and uploading their minds to data hubs.<ref name="beta">[[Databank (Subnautica)#Alien Sanctuary Beta|Databank Entry: Alien Sanctuary Beta]]</ref> It is believed that any remaining Architects who did not upload their minds to caches are killed off by Kharaa.
*The living Sea Emperor Leviathan trains [[Peeper]]s carrying small amounts of Enzyme 42 to use the [[Alien Vents]] and distribute the enzyme around the planet.


===Degasi Period Events===
===[[Mercury II]] crash===
* Several decades prior to the crash of the Aurora, the Sol Transgov vessel [[Mercury II]] is forced down relatively intact by the Quarantine Enforcement Platform, landing in the [[Arctic Spires]].
*About a decade before the [[Aurora]] the [[Degasi]] crashes on 4546B.
* The crew makes repairs and attempts to collect biological samples, but is impeded by the ferocious wildlife of Planet 4546B, particularly [[Ice Worm]]s.
*The Degasi survivors build their bases on the Floating Island, however, due to heavy rainfall and [[Marguerit Maida|Marguerit's]] persistence, they relocate to the [[Jellyshroom Cave]], and Marguerit uncovers a [[Alien Tablets#Orange Tablet|tablet]].
*Kharaa Bacterium-infected crew members are quarantined and left behind with survival gear and supplies. The captain hopes to retrieve them, but is not optimistic.
*The Degasi survivors relocate again to the [[Deep Grand Reef]], where Bart explains to his father and Marguerit that they are infected with something that is not recorded in the [[Databank]]. After Marguerit brings an injured [[Reaper Leviathan]] to the base, a second Reaper Leviathan, having followed Marguerit back, attacked and destroyed the base. Marguerit chased the creature, intent on killing it, whilst [[Paul Torgal|Paul]] followed a light he saw (possibly a [[Mesmer]]), [[Bart Torgal|Bart]] managed to elude the creature and fled to presumably the [[Safe Shallows]] or [[Crash Zone]] and possibly the [[Floating Island]].
* On takeoff, the Quarantine Enforcement Platform shoots the Mercury II again, this time scoring a direct hit and breaking it apart. The pieces crash near Delta Island. All survivors are presumed dead within days.
*Bart manages to survive for an unspecified amount of time, able to build himself a Seabase and a Seamoth. Although he eventually went back to the Floating Island, where he wrote his final log, and most likely succumbs to Kharaa.

===[[Degasi]] crash===
*10 years prior to the crash of the ''[[Aurora]]'', the Quarantine Enforcement Platform shoots down the ''[[Degasi]]'' which crashes on Planet 4546B.
*The Degasi survivors build their bases on the Floating Island, where Marguerit finds a [[Purple Tablet]], however, due to heavy rainfall and [[Marguerit Maida|Marguerit's]] persistence, they relocate to the [[Jellyshroom Cave]], and Marguerit uncovers an [[Alien Tablets#Orange Tablet| Orange Tablet]].
*The Degasi survivors relocate again to the [[Deep Grand Reef]], where Bart explains to his father and Marguerit that they are infected with something that is not recorded in the [[Databank]]. After Marguerit brings an injured [[Reaper Leviathan]] to the base, a second Reaper Leviathan, having followed Marguerit back, attacked and destroyed the base. Marguerit chased the creature, intent on killing it, whilst [[Paul Torgal|Paul]] followed a light he saw (possibly a [[Mesmer]], and was presumably killed by a [[Crabsquid]]), [[Bart Torgal|Bart]] managed to elude the creature and fled to presumably the [[Safe Shallows]] or [[Crash Zone]] and possibly the [[Floating Island]].
*Bart manages to survive for an unspecified amount of time, able to build himself a [[Seabases (Subnautica)|Seabase]] and a [[Seamoth]]. Although he eventually went back to the Floating Island, where he wrote his final log, and most likely succumbs to Kharaa.
*[[Marguerit Maida]] escapes to [[Sector Zero]]<ref name="log6">[[Databank (Below Zero)#Marguerit Maida's Log #3|Databank Entry: Marguerit Maida's Log #3]]</ref> while the other survivors are presumed dead.

==''Subnautica''==

=== [[Aurora]] crash ===
*The [[Aurora]] attempts to perform a slingshot maneuver in the atmosphere of Planet 4546B with 157 people aboard to begin the construction of a new phase gate in the Ariadne Arm.<ref name="launch">[[Databank (Subnautica)#Alterra Launches the Aurora|Databank Entry: Alterra Launches the Aurora]]</ref> Secretly, the Aurora is also tasked with locating the crew of the ''Degasi'',<ref name="secret">[[Databank (Subnautica)#Aurora Auxiliary Mission Orders|Databank Entry: Aurora Auxiliary Mission Orders]]</ref> although the crew did not expect to find anything.<ref name="secret2">[[Databank (Subnautica)#Aurora Scanner Room Voice Log|Databank Entry: Aurora Scanner Room Voice Log]]</ref>
*The [[Quarantine Enforcement Platform]] detects the ''Aurora'' and fires at it, resulting in it crashing on 4546B, and the crew is forced to evacuate.
*29 to 44 people manage to eject in Lifepods 1-25, but only ten manage to make it to the surface. It is possible that other life pods made it to the surface, however outside [[the Crater]], but probably succumbed to the [[Ghost Leviathan|Ghost Leviathans]] that reside in the void. Only one Lifepod carried a dead passenger. Each Lifepod landed in different [[Biome]]s. One, in particular, is [[Lifepod 5]], housing the Non-Essential Systems Maintenance Chief, [[Ryley Robinson]]. He is knocked unconscious for three hours by a loose panel during its descent. All the other surviving crew members perished during this period of unconsciousness.

(Everything after this may be completed in another order while playing the game.)


===Aurora Period Events===
*A decade later, the [[Aurora]] attempts to perform a slingshot maneuver in the atmosphere of Planet 4546B with 157 people aboard to begin the construction of a new phase gate in the Ariadne Arm. However, while doing so, the [[Quarantine Enforcement Platform]] detects the ship and fires at it, resulting in it crashing on 4546B, and the crew is forced to evacuate.
*29 to 44 people manage to eject in Lifepods 1-25, but only ten manage to make it to the surface, with only one carrying a dead passenger. Each Lifepod landed in different [[Biome]]s. One, in particular, is [[Lifepod 5]], housing the Non-Essential Systems Maintenance Chief, [[Ryley Robinson]]. He is knocked unconscious for three hours by a loose panel during its descent. All the other surviving crew members perished during this period of unconsciousness.
*The Aurora's drive core explodes.
*The Aurora's drive core explodes.

=== [[Sunbeam]] arrival ===
*After (arguably) one week, the [[Sunbeam]] picks up a distress call and comes to rescue Ryley.
*After (arguably) one week, the [[Sunbeam]] picks up a distress call and comes to rescue Ryley.
*The Sunbeam sends the coordinates for the [[Mountain Island]], where they will land.
*The Sunbeam sends the coordinates for the [[Mountain Island]], where they will land.
*The Sunbeam is destroyed by the Quarantine Enforcement Platform, which Ryley explores, discovering [[Alien Tablets]], the Control Room, and the approximate location of the Disease Research Facility.
*The Sunbeam is destroyed by the Quarantine Enforcement Platform, which Ryley explores, discovering [[Alien Tablets]], the Control Room, and the approximate location of the Disease Research Facility.
*After exploring the Mountain Island, Ryley finds the [[Alien Arches|Alien Arch]] within, and activates it, taking him to the [[Floating Island]], where he also discovers the Degasi Seabases.
*After exploring the Mountain Island, Ryley finds the [[Alien Arches|Alien Arch]] within, and activates it, taking him to the [[Floating Island]], where he also discovers the Degasi Seabases.

=== [[Disease Research Facility]] ===
*Ryley goes to the [[Disease Research Facility]], and discovers the nature of [[Kharaa Bacterium|Kharaa]] and realizes that he is infected.
*Ryley goes to the [[Disease Research Facility]], and discovers the nature of [[Kharaa Bacterium|Kharaa]] and realizes that he is infected.
*After the incubation period for Kharaa is finished (two weeks, at this time), the coordinates for the [[Alien Thermal Plant]] are received.
*After the incubation period for Kharaa is finished (two weeks, at this time), the coordinates for the [[Alien Thermal Plant]] are received.

=== [[Inactive Lava Zone|Lava Zone]] ===
*Ryley reaches the Alien Thermal Plant and attains the Blue Tablet, along with the [[Ion Battery]] and [[Ion Power Cell]] blueprints.
*Ryley reaches the Alien Thermal Plant and attains the Blue Tablet, along with the [[Ion Battery]] and [[Ion Power Cell]] blueprints.

=== [[Sea Emperor Leviathan]] ===
*Ryley reaches the [[Primary Containment Facility]] and encounters the now 2600-year-old [[Sea Emperor Leviathan]].
*Ryley reaches the [[Primary Containment Facility]] and encounters the now 2600-year-old [[Sea Emperor Leviathan]].
*The Sea Emperor Leviathan telepathically communicates with Ryley and explains that its eggs must be hatched in order to eradicate Kharaa.
*The Sea Emperor Leviathan telepathically communicates with Ryley and explains that its eggs must be hatched in order to eradicate Kharaa.
*Ryley hatches the eggs after gathering various flora from different [[biomes]] using the Arches, and the [[Sea Emperor Leviathan (Babies)|Sea Emperor Leviathan Babies]] release the stable form of Enzyme 42, otherwise known as [[Baby Leviathan Enzymes]]. Ryley interacts with the Enzymes and is thus cured. After playing with their parent, the Babies leave the aquarium through the Arch behind the Incubator. Their parent stays behind as it is far too large to travel through the Arch, eventually, it dies here, though Ryley never sees this.
*Ryley hatches the eggs after gathering various flora from different [[biomes]] using the Arches, and the [[Sea Emperor Leviathan (Babies)|Sea Emperor Leviathan Babies]] release the stable form of Enzyme 42, otherwise known as [[Baby Leviathan Enzymes]]. Ryley interacts with the Enzymes and is thus cured. After playing with their parent, the Babies leave the aquarium through the Arch behind the Incubator. Their parent stays behind as it is far too large to travel through the Arch, eventually, it dies here, though Ryley never sees this.
* Ryley goes through the Aquarium Arch which is connected to an Arch on a suspended platform close to the [[Quarantine Enforcement Platform]], he enters, and, now cured, is able to disable the weapon, allowing him to escape.
* Ryley goes through the Aquarium Arch which is connected to an Arch on a suspended platform close to the [[Quarantine Enforcement Platform]], he enters, and, now cured, is able to disable the weapon, allowing him to escape.

=== [[Neptune Escape Rocket]] ===
*Ryley returns to the now-destroyed [[Aurora]] and obtains the [[Neptune Escape Rocket]] blueprint, where he eventually constructs it.
*Ryley returns to the now-destroyed [[Aurora]] and obtains the [[Neptune Escape Rocket]] blueprint, where he eventually constructs it.
*After entering the rocket, and activating it, blasting off from [[Planet 4546B]]. While orbiting the planet, the Sea Emperor Leviathan communicates with Ryley one last time, just before he leaves the system, heading back to Earth.
*After entering the rocket, he activates it, blasting off from [[Planet 4546B]]. While orbiting the planet, the Sea Emperor Leviathan communicates with Ryley one last time, just before he leaves the system, heading back to Earth.
*He is then met with a notice that in order to land, he has to pay a 1,000,000,000,000 credits fee that he has accumulated by using the planet's resources.
*He is then met with a notice that in order to land, he has to pay a 1,000,000,000,000 credits fee that he has accumulated by using the planet's resources.
*After Ryley returns, Alterra Corporation learns of the value the planet holds.


==Below Zero Story Events==
==''Below Zero''==
=== [[Xenoworx]] and [[Alterra Corporation|Alterra]] ===
{{Expansion Section}}
* Alterra starts funding [[Xenoworx|XenoWorx]], supplying with tools, resources, and money; this includes an all-new [[PDA|Alterra PDA]].
===Sentinel Period Events===
* Ryley Robinson likely returns to Alterra.
* XenoWorx is branded as "an Alterra initiative."
* Alterra learns of the value the planet holds.
* [[w:c:Subnautica-belowzero:Sentinel|The Sentinel]] is installed in orbit for research.
* [[w:c:Subnautica-belowzero:Robin Ayou|Robin Ayou]] ejects in a life pod from the Sentinel and a meteor hits it, crashing it.
* Robin finds out about [[w:c:Subnautica-belowzero:Al-An|AI-An]]. Alan admits his storage is failing. Robin tries and download him into her [[PDA]], but ends up downloading him into her brain instead.
*


=== [[Sam Ayou|Sam]] and [[Robin Ayou]] ===
==Unspecified Events==
* [[Sam Ayou|Sam]] receives a job from Alterra for an extraplanetary mission to 4546B.
*At an unspecified time, the Precursors obtain various relics from other alien races, including humankind, shown by the 13th century Earth sword and the Yin and Yang carving held in the Primary Containment Facility.
* [[Robin Ayou|Robin]] has mixed feelings about Sam's job but congratulates her anyway.
*At one point, Earth dolphins became extinct.
* Sam sends pictures of her base to Robin and keeps in contact with her.
*A meteor struck 4546B sometime in the past in the [[Dunes]] biome. It is assumed that this occurred sometime in the last 1,000 years as the Precursor cache in the crater has no normal entrance and one of the pillars has toppled, causing it to appear as if it has been destroyed by the meteor impact.
* Robin receives a notice of death from Alterra that states that Sam has died in a [[Phi Excavation Site|tragic accident]].
*A new strain of Kharaa evolves the ability to control and alter the structure of living creatures, causing the events of Natural Selection and Natural Selection 2.
* Robin takes a passenger shuttle from Cal to head to [[Planet 4546B|4546B]] and find out what happened to Sam.
*The Precursors construct the [[Warper]] out of various creatures from different planets. Whether this happened during their period on 4546B or prior, is unknown.


=== [[Sector Zero]] ===
==Non-Canonical Events==
* Robin's passenger shuttle runs into a meteor and crash-lands in [[Sector Zero]] of [[Planet 4546B]].
*If Ryley disables the Quarantine Enforcement Platform before the Sunbeam arrives, the Sunbeam will survive, though they state they cant get to the planet because of the massive debris zone that appeared when the Aurora gets shot by the QEP, but, he will still need to get the Rocket blueprint. This event is generally considered non-canon.
* Robin escapes into the water and finds the [[Drop Pod]] that was deployed during descent.
* Robin searches for Sam with the use of the picture Sam sent.


=== [[Sanctuary Zero]] ===
==Trivia==
* A [[Al-An|voice]] sends an S.O.S to Robin.
*Given that the Precursors likely obtained the Earth Sword around 1000 years ago, and the sword itself being of 13th-century Mongolian design, it is likely that the Precursors visited Earth during the [[Wikipedia:Third Crusade|third crusade]] era (1189–1192). From this, it can be deduced that the game takes place in the timeframe of 2160-2199.
* The voice requires a storage system and refers to Robin's cerebral cortex as a suitable component which Robin misinterprets as her [[PDA]].
* Robin attempts to transfer the voice's consciousness into her PDA, but the voice transfers into her brain.


=== [[Delta Station]] ===
* Robin's PDA detects a beacon signal on [[Delta Island]].
*Robin receives a recorded message from an unidentified woman.
*Robin encounters the woman, and the woman warns Robin to get off her land.
*[[Marguerit Maida]] requests that Robin hacks the [[Communications Tower]] on Delta Island.
* Robin inserts a [[Test Override Module]] into the mainframe of the [[Communications Tower|tower]], causing it to enter Test Mode, disabling communication.

=== [[Marguerit's Greenhouse]] ===
* After Robin hacked the Communications Tower, she receives a call from Marguerit. Robin learns about the location of Marguerit's Greenhouse.
* Robin arrives at Marguerit's Greenhouse, Marguerit is planting [[Preston's Plant]] and talking to Robin about her opinions of [[Alterra Corporation|Alterra]] and Sam.

=== [[Omega Lab]] ===
* Omega Lab according to the clue of [[Databank (Below Zero)|Alterra Facility Map]].
*Robin explores Omega Lab and discovers that the lab was sabotaged.

=== [[Phi Robotics Center]] ===

* Robin arrives at Phi Robotics Center and notes that it was where Sam worked.

* She finds the [[Spy Pengling]] lab, [[Zeta Landon|Zeta]]'s office, the kitchen, the Administration office, and [[Sam Ayou]]'s bedroom.

=== [[Phi Excavation Site]] ===

* Robin finds the site of Sam's death, as well as her necklace nearby. She finds the [[Frozen Leviathan]].

* She completes her sister's work and cures it.

=== [[Fabricator Base]] ===

* Robin creates [[Al-An's Vessel|Al-An's Storage Medium]] and the parts to it. [[Al-An]] tells robin to go to The [[Architect Phase Gate Facility]].

=== [[Architect Phase Gate Facility]] ===

* Robin arrives at the Architect Phase Gate Facility.
*Al-An opens a Phasegate to an unknown location. He tells Robin to finish any remaining business on the planet, and then leaves.
*Robin goes through the phase gate where Al-An is opening a Large Phasegate. He gives Robin a pair of Architect Arms to help align energy masts to build an Architect Ship to fly through the Large Phasegate.
*Al-An builds and teleports to the ship, linking with it. Robin then also teleports on board.
*Al-An starts the ship, and flies through the Phasegate. He and Robin then fly through an asteroid field, to a Second Phasegate to reach the Homeworld.

==Non-canon events==
*If Ryley disables the [[Quarantine Enforcement Platform]] before the ''[[Sunbeam]]'' arrives, the ''Sunbeam'' will survive but cannot approach the planet because of the debris field from the ''[[Aurora]]'' crash, forcing Ryley to build an [[Neptune Escape Rocket|escape rocket]] anyway.
*A new strain of [[Kharaa Bacterium|Kharaa]] evolves the ability to control and alter the structure of living creatures, causing the events of ''Natural Selection'' and ''Natural Selection 2''.

==Trivia==
* The events of Subnautica take place after the mid 22nd century; meanwhile, Subnautica: Below Zero is set two years after the first installment.
==References==
==References==
<references />[[ru:Сюжет|ru: Сюжет]]
<references />
[[pl:Fabuła]]
[[ru:Сюжет]]
[[Category:Story]]
[[Category:Story]]

Latest revision as of 18:16, 25 February 2025

Spoiler (BZ).png Read at own risk
This article contains unmarked spoilers. Players new to the game would want to avoid or be cautious toward this article.


This page details the events depicted in Subnautica and Subnautica: Below Zero in what is presumed to be the correct canonical order. Some players might encounter the events in a different order, but the general story is still unaffected. All information is taken from in-game lore and developer statements.

Pre-Subnautica

  • At some point, dolphins on Earth become extinct.[1]
  • Alterra Corporation begins as a defense manufacturer startup in the mid-22nd century.
    • Somewhere down the line, Alterra is recognized as a trans-gov; fulfilling the role as the TSF's official supplier, as well as one of the largest technology suppliers for the federation.
    • Heavily influenced by Alterra's threats to cut weapon supplies, the warring factions end hostilities during the Expansion and sign the Charter.[2].

Architect period

  • The Architects discover the Kharaa Bacterium on an outer planet during a routine network expansion. A network error caused the Architects' routine quarantine procedure to fail, resulting in at least 143 billion deaths on their core worlds. The Architects quarantined their core worlds and brought Kharaa to isolated disease research facilities, including on Planet 4546B, in order to research and develop a cure.[3] The Architects construct the Quarantine Enforcement Platform, Disease Research Facility, Alien Thermal Plant, and Sanctuary Caches and began constructing Warpers (whether this was the first time Warpers were constructed is unknown). It is believed the Architects also discovered the Gargantuan Fossil around this time and began to take samples from its rib cage.
  • A meteorite strikes 4546B in the Dunes biome. The resulting crater blocks the entrance to the Architect cache and the impact toppled one of the cache's pillars.
  • The Architects discover the Sea Emperor Leviathan species produces Enzyme 42, a complex compound that provides immunity to Kharaa. They construct the Primary Containment Facility and Alien Arch Caches. They also capture a 1600-year-old Sea Emperor Leviathan and her seven eggs and place them in the Primary Containment Facility. It is believed the Architects also discovered the Ancient Skeleton and constructed the Lost River Laboratory Cache around this time.
  • The Architects place various relics from other alien races, including humankind, in the Primary Containment Facility.
  • After testing the living Sea Emperor Leviathan, the Architects discover she is too old to produce Enzyme 42 potent enough to work as a permanent cure. Instead, the Architects research the unborn eggs on the premise that a younger specimen would produce stronger enzymes. The Sea Emperor Leviathan attempts to telepathically communicate to the Architects that forcefully hatching the eggs would not work, but, according to her, "they could not hear."
  • The Architects dissect a Sea Emperor Leviathan egg to study the fetus, but the process killed the fetus. They place a second egg and more eggs from other species on the planet in the Primary Containment Facility's egg lab for further research. The Architects place the remaining five Sea Emperor Leviathan eggs into the Incubator Device.
  • The Architects take a Sea Dragon Leviathan egg to the Disease Research Facility to study Leviathan Class egg hatching conditions. The parent Sea Dragon tracks down the egg and rams into the facility, destroying the facility but killing the Sea Dragon shortly afterward. The facility's destruction causes the release of Kharaa on the planet; the Architects subsequently initiate a planetary quarantine, activating the Quarantine Enforcement Platform and ceasing construction of further Warpers.
  • Kharaa kills a majority of species on the planet, forcing the ancestors of the modern-day species to rapidly evolve to match the drastic changes in the ecosystem. The Sea Emperor Leviathan species is killed off due to their food source being wiped out by Kharaa, except for the last remaining specimen and her eggs in the Primary Containment Facility.
  • The remaining Architects evacuate to the sanctuary caches, disposing of their bodies and uploading their minds to data hubs.[4] It is believed that any remaining Architects who did not upload their minds to caches are killed off by Kharaa.
  • The living Sea Emperor Leviathan trains Peepers carrying small amounts of Enzyme 42 to use the Alien Vents and distribute the enzyme around the planet.

Mercury II crash

  • Several decades prior to the crash of the Aurora, the Sol Transgov vessel Mercury II is forced down relatively intact by the Quarantine Enforcement Platform, landing in the Arctic Spires.
  • The crew makes repairs and attempts to collect biological samples, but is impeded by the ferocious wildlife of Planet 4546B, particularly Ice Worms.
  • Kharaa Bacterium-infected crew members are quarantined and left behind with survival gear and supplies. The captain hopes to retrieve them, but is not optimistic.
  • On takeoff, the Quarantine Enforcement Platform shoots the Mercury II again, this time scoring a direct hit and breaking it apart. The pieces crash near Delta Island. All survivors are presumed dead within days.

Degasi crash

  • 10 years prior to the crash of the Aurora, the Quarantine Enforcement Platform shoots down the Degasi which crashes on Planet 4546B.
  • The Degasi survivors build their bases on the Floating Island, where Marguerit finds a Purple Tablet, however, due to heavy rainfall and Marguerit's persistence, they relocate to the Jellyshroom Cave, and Marguerit uncovers an Orange Tablet.
  • The Degasi survivors relocate again to the Deep Grand Reef, where Bart explains to his father and Marguerit that they are infected with something that is not recorded in the Databank. After Marguerit brings an injured Reaper Leviathan to the base, a second Reaper Leviathan, having followed Marguerit back, attacked and destroyed the base. Marguerit chased the creature, intent on killing it, whilst Paul followed a light he saw (possibly a Mesmer, and was presumably killed by a Crabsquid), Bart managed to elude the creature and fled to presumably the Safe Shallows or Crash Zone and possibly the Floating Island.
  • Bart manages to survive for an unspecified amount of time, able to build himself a Seabase and a Seamoth. Although he eventually went back to the Floating Island, where he wrote his final log, and most likely succumbs to Kharaa.
  • Marguerit Maida escapes to Sector Zero[5] while the other survivors are presumed dead.

Subnautica

Aurora crash

  • The Aurora attempts to perform a slingshot maneuver in the atmosphere of Planet 4546B with 157 people aboard to begin the construction of a new phase gate in the Ariadne Arm.[6] Secretly, the Aurora is also tasked with locating the crew of the Degasi,[7] although the crew did not expect to find anything.[8]
  • The Quarantine Enforcement Platform detects the Aurora and fires at it, resulting in it crashing on 4546B, and the crew is forced to evacuate.
  • 29 to 44 people manage to eject in Lifepods 1-25, but only ten manage to make it to the surface. It is possible that other life pods made it to the surface, however outside the Crater, but probably succumbed to the Ghost Leviathans that reside in the void. Only one Lifepod carried a dead passenger. Each Lifepod landed in different Biomes. One, in particular, is Lifepod 5, housing the Non-Essential Systems Maintenance Chief, Ryley Robinson. He is knocked unconscious for three hours by a loose panel during its descent. All the other surviving crew members perished during this period of unconsciousness.

(Everything after this may be completed in another order while playing the game.)

  • The Aurora's drive core explodes.

Sunbeam arrival

  • After (arguably) one week, the Sunbeam picks up a distress call and comes to rescue Ryley.
  • The Sunbeam sends the coordinates for the Mountain Island, where they will land.
  • The Sunbeam is destroyed by the Quarantine Enforcement Platform, which Ryley explores, discovering Alien Tablets, the Control Room, and the approximate location of the Disease Research Facility.
  • After exploring the Mountain Island, Ryley finds the Alien Arch within, and activates it, taking him to the Floating Island, where he also discovers the Degasi Seabases.

Disease Research Facility

Lava Zone

Sea Emperor Leviathan

  • Ryley reaches the Primary Containment Facility and encounters the now 2600-year-old Sea Emperor Leviathan.
  • The Sea Emperor Leviathan telepathically communicates with Ryley and explains that its eggs must be hatched in order to eradicate Kharaa.
  • Ryley hatches the eggs after gathering various flora from different biomes using the Arches, and the Sea Emperor Leviathan Babies release the stable form of Enzyme 42, otherwise known as Baby Leviathan Enzymes. Ryley interacts with the Enzymes and is thus cured. After playing with their parent, the Babies leave the aquarium through the Arch behind the Incubator. Their parent stays behind as it is far too large to travel through the Arch, eventually, it dies here, though Ryley never sees this.
  • Ryley goes through the Aquarium Arch which is connected to an Arch on a suspended platform close to the Quarantine Enforcement Platform, he enters, and, now cured, is able to disable the weapon, allowing him to escape.

Neptune Escape Rocket

  • Ryley returns to the now-destroyed Aurora and obtains the Neptune Escape Rocket blueprint, where he eventually constructs it.
  • After entering the rocket, he activates it, blasting off from Planet 4546B. While orbiting the planet, the Sea Emperor Leviathan communicates with Ryley one last time, just before he leaves the system, heading back to Earth.
  • He is then met with a notice that in order to land, he has to pay a 1,000,000,000,000 credits fee that he has accumulated by using the planet's resources.
  • After Ryley returns, Alterra Corporation learns of the value the planet holds.

Below Zero

Xenoworx and Alterra

  • Alterra starts funding XenoWorx, supplying with tools, resources, and money; this includes an all-new Alterra PDA.
  • XenoWorx is branded as "an Alterra initiative."

Sam and Robin Ayou

  • Sam receives a job from Alterra for an extraplanetary mission to 4546B.
  • Robin has mixed feelings about Sam's job but congratulates her anyway.
  • Sam sends pictures of her base to Robin and keeps in contact with her.
  • Robin receives a notice of death from Alterra that states that Sam has died in a tragic accident.
  • Robin takes a passenger shuttle from Cal to head to 4546B and find out what happened to Sam.

Sector Zero

  • Robin's passenger shuttle runs into a meteor and crash-lands in Sector Zero of Planet 4546B.
  • Robin escapes into the water and finds the Drop Pod that was deployed during descent.
  • Robin searches for Sam with the use of the picture Sam sent.

Sanctuary Zero

  • A voice sends an S.O.S to Robin.
  • The voice requires a storage system and refers to Robin's cerebral cortex as a suitable component which Robin misinterprets as her PDA.
  • Robin attempts to transfer the voice's consciousness into her PDA, but the voice transfers into her brain.

Delta Station

  • Robin's PDA detects a beacon signal on Delta Island.
  • Robin receives a recorded message from an unidentified woman.
  • Robin encounters the woman, and the woman warns Robin to get off her land.
  • Marguerit Maida requests that Robin hacks the Communications Tower on Delta Island.
  • Robin inserts a Test Override Module into the mainframe of the tower, causing it to enter Test Mode, disabling communication.

Marguerit's Greenhouse

  • After Robin hacked the Communications Tower, she receives a call from Marguerit. Robin learns about the location of Marguerit's Greenhouse.
  • Robin arrives at Marguerit's Greenhouse, Marguerit is planting Preston's Plant and talking to Robin about her opinions of Alterra and Sam.

Omega Lab

  • Omega Lab according to the clue of Alterra Facility Map.
  • Robin explores Omega Lab and discovers that the lab was sabotaged.

Phi Robotics Center

  • Robin arrives at Phi Robotics Center and notes that it was where Sam worked.

Phi Excavation Site

  • Robin finds the site of Sam's death, as well as her necklace nearby. She finds the Frozen Leviathan.
  • She completes her sister's work and cures it.

Fabricator Base

Architect Phase Gate Facility

  • Robin arrives at the Architect Phase Gate Facility.
  • Al-An opens a Phasegate to an unknown location. He tells Robin to finish any remaining business on the planet, and then leaves.
  • Robin goes through the phase gate where Al-An is opening a Large Phasegate. He gives Robin a pair of Architect Arms to help align energy masts to build an Architect Ship to fly through the Large Phasegate.
  • Al-An builds and teleports to the ship, linking with it. Robin then also teleports on board.
  • Al-An starts the ship, and flies through the Phasegate. He and Robin then fly through an asteroid field, to a Second Phasegate to reach the Homeworld.

Non-canon events

  • If Ryley disables the Quarantine Enforcement Platform before the Sunbeam arrives, the Sunbeam will survive but cannot approach the planet because of the debris field from the Aurora crash, forcing Ryley to build an escape rocket anyway.
  • A new strain of Kharaa evolves the ability to control and alter the structure of living creatures, causing the events of Natural Selection and Natural Selection 2.

Trivia

  • The events of Subnautica take place after the mid 22nd century; meanwhile, Subnautica: Below Zero is set two years after the first installment.

References

  1. ↑ Databank Entry: Cuddlefish
  2. ↑ Trans-Gov Profile: Alterra Corp
  3. ↑ Databank Entry: Kharaa Contagion Profile
  4. ↑ Databank Entry: Alien Sanctuary Beta
  5. ↑ Databank Entry: Marguerit Maida's Log #3
  6. ↑ Databank Entry: Alterra Launches the Aurora
  7. ↑ Databank Entry: Aurora Auxiliary Mission Orders
  8. ↑ Databank Entry: Aurora Scanner Room Voice Log
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