Storyline

This page details the events depicted in Subnautica in which they are meant to happen.

NOTE: that the story of the game can change during development.

Canonical Events

 * The Precursor Race discovers Carar on an unknown planet and begin to study the bacterium.
 * Errors in quarantine procedures cause Carar to be spread to their core worlds, which are quarantined.
 * The Precursors set up set up several research outposts to attempt to develop a vaccine, including on on Planet 4546B. The Quarantine Enforcement Platform, the Disease Research Facility, and the Precursor Thermal Power Generator are constructed, as well as the Precursor Caches (Sparse Reef, Blood Kelp Zone, Dunes, and Ghost Canyon).
 * After many tests, the Sea Emperor Leviathan species is found to have a immunity to Carar, and the Primary Containment Facility is constructed, along with the Warp Gate Caches in various biomes. The Precursors put a Sea Emperor Leviathan inside, along with its nine eggs.
 * Precursors take a Sea Dragon Leviathan egg for research on leviathan egg hatching conditions, and the parent destroys the Disease Research Facility, releasing Carar and initiating the planetary quarantine.
 * The Precursors dissected three eggs for testing, taking another one and putting it up for display, and put the remaining five eggs into the Incubator Device.
 * The Sea Emperor Leviathan species is killed off due to their food source being wiped out by Carar, save for the one in containment.
 * Remaining Precursors are evacuated to sanctuaries where their bodies are disposed of and their minds uploaded to data hubs.
 * The Sea Emperor Leviathan trains Peepers to use the Alien Pipe System.
 * 990 years later, the Degasi crashes on 4546B.
 * The Degasi survivors build their bases on the Floating Island, however, due to flooding and Marguerit's persistence, they relocate to the Jelly Shroom Caves, and Marguerit uncovers the orange artifact.
 * The Degasi survivors relocate again to the Deep Grand Reef, where Bart explains to his father and Marguerit that they are infected with something. After Marguerit brings back a Reaper Leviathan to the base, an unspecified leviathan creature attacked the base. Marguerit and Paul's fates are unknown, but Bart managed to elude the creature and made his way back to the Floating Island, where he wrote a final log, and current status remains unknown.
 * Almost a decade later, the Aurora crashes on 4546B, the player is knocked for three hours by a loose panel, any other surviving crew members perished during this period of unconsciousness.
 * The Aurora explodes.
 * After (arguably) one week, the Sunbeam picks up a distress call and comes to rescue the player.
 * The Sunbeam sends the coordinates for the Mountain Island.
 * The Sunbeam is destroyed by the Quarantine Enforcement Platform, which the player explores, discovering Alien Artifacts, the Deactivation Terminal, and the coordinates for the Disease Research Facility.
 * After exploring the Mountain Island, the player finds the Alien Warp Gate within, and activates it, taking him to the Floating Island, where he also discovers the Degasi Seabases.
 * The player goes to the Disease Research Facility, and discovers the nature of Carar and realizes that he is infected.
 * After the incubation period for Carar is finished (two weeks, at this time), the coordinates for the Precursor Thermal Power Generator is received.
 * The player reaches the generator, and gains the Blue Artifact, along with the Ion Battery and Ion Power Cell blueprints.
 * The player reaches the Primary Containment Facility, and encounters the Sea Emperor Leviathan.
 * The Sea Emperor Leviathan communicates with the player, and explains that it's eggs must be hatched in order to eradicate Carar.
 * The player hatches the eggs after gathering various flora from different biomes using the Warp Gates, and the Sea Emperor Leviathan (Babies) release a more stable Enzyme 42. The Player interacts with it, and is thus cured. After playing with their parent, they go through the Warp Gate above the Incubator, and their parent stays behind, where it eventually dies.
 * The player goes through the Aquarium Warp Gate which leads just outside the Quarantine Enforcement Platform, he enters, and manages to disable the weapon, allowing him to escape and the juveniles to spread Enzyme 42 around the world.
 * The player returns to the Aurora and obtains the Rocket Launch Platform blueprint, where he eventually constructs it.
 * The player enters the rocket, and activates it, blasting off from Planet 4546B.

Unspecified Events

 * At an unspecified time, the Precursors obtain various relics from other alien races, including humanity, which they obtained during the 13th century from the Mongolian Empire.