Planet 4546b

Planet 4546B is a category-3 ocean planet on which the story of Subnautica and Subnautica: Below Zero take place.

Around 1,000 years ago the Architects set up research outposts on 4546B to study a deadly pathogen named the Kharaa Bacterium. Kharaa is not native to 4546B, being discovered on another, unnamed planet. When Kharaa broke out on 4546B a quarantine was enforced, resulting in the events of Subnautica 1000 years later.

Following Ryley Robinson's return to Alterra, the aforementioned company installs a number of bases and outposts throughout Sector Zero, and presumably the entire planet, to harness its natural resources and conduct research on the secrets the planet holds.

Planet 4546B is located in the outer reaches of the Ariadne Arm. 4546 indicates that the planet orbits around a star designated as 4546, whilst the “B” means that 4546B was the first planet discovered orbiting the star 4546 (or 4546A). There are at least ten other celestial bodies in the system, each of which is larger than Earth's Moon.[1] Planet 4546B itself is an ocean planet and is said to be smaller than Earth[2] with a breathable oxygen-nitrogen atmosphere. It also harbors two moons, one being very close to the planet, causing frequent solar eclipses.

There are three known major ecosystems on the planet: the Crater, Sector Zero, and the Dead Zone, the latter of which covers the majority of the planet.

The planet is almost completely covered in water, except for a few islands, and features a variety of submerged, ecologically distinct biomes. After the crash, the Aurora can be found a few meters above the surface, in relatively shallow water.

The Crater features a full ecosystem of flora and fauna. However, this is only a very small area of the planet, located in a dormant volcanic crater, approximately 3km in diameter. The Arctic supports a nearly completely different ecosystem, harboring more creatures and plants adapted to the colder temperatures. The rest of the ocean is known as the Crater Edge, it is extremely deep and nearly devoid of life, supporting only microscopic life forms, and Leviathan Class Organisms. It is unknown whether any similar areas of life exist elsewhere other than the Crater and Sector Zero.

Precursor and PDA data make note of high thermal activity from the planet's core. This is evidenced by the Inactive Lava Zone and Lava Lakes, respectively. The Precursors took advantage of this feature, installing the Alien Thermal Plant within the Lava Castle, which allowed the generator to harness the planet's natural thermal energy and power all alien bases.

A day and night cycle on Planet 4546B lasts about 20 minutes of real-time.

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, however, due to heavy rainfall and Marguerit's persistence, they relocate to the Jellyshroom Cave, and Marguerit uncovers a 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.

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 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.

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Quarantine Enforcement Platform
GunInfoboxPic
Tab
Alien Bases
Type
Alien Structure
Biome
Mountain Island
goto ID
gun
gunmoonpool
gun_elevator_enter
gun_elevator_exit
Coordinates
375 8 1106
Music
Alien Expanse
Alien Passageways
Alien Spaces
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Kharaa Bacterium
Kharaa Bacterium
Mountain Island
Mountain Island
Sunbeam
Sunbeam
Alien Thermal Plant
Alien Thermal Plant
Subnautica Wiki
Subnautica Wiki
Disease Research Facility
Disease Research Facility
Primary Containment Facility
Primary Containment Facility
Sea Emperor Leviathan
Sea Emperor Leviathan
Neptune Escape Rocket
Neptune Escape Rocket

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Scans indicate this structure is composed of a metal alloy with unprecedented integrity. No matches found in database. Performing structural analysis.
PDA

The Quarantine Enforcement Platform is a massive Alien weapon system that is located on the Mountain Island. It is the source of the energy beam responsible for causing the Degasi, the Aurora, and the Mercury II to crash on Planet 4546B, as well as destroying the Sunbeam during its rescue attempt.

The Quarantine Enforcement Platform was built by the Precursor Race around one thousand years ago, in order to contain the Kharaa Bacterium. Near one of the entrances, an Alien Arch connecting to the Primary Containment Facility can be found. There is only one Quarantine Enforcement Platform on the entirety of Planet 4546B as its beam can bend around the planet to strike ships on the other side. The main section of the structure stretches from 20 meters above the surface to 130 meters below it, with the cannon adding an additional 110 meters to its height even in its resting state.

The player must locate a Purple Tablet to gain entrance to the Quarantine Enforcement Platform without using the moonpool

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.

Ryley goes to the Disease Research Facility, and discovers the nature of 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.

Ryley reaches the Alien Thermal Plant and attains the Blue Tablet, along with the Ion Battery and Ion Power Cell blueprints.

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.

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.
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.

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].

Planet Environment Scan

• Category 3 Ocean planet
• Oxygen/Nitrogen Atmosphere
• Extensive biodiversity

Safety Warnings:

• May support leviathan class predators
• Water contaminated with high levels of foreign bacteria
• Planet is beyond federation space, rescue unlikely

It is not recommended to explore this environment without hazardous material suits and extensive support apparatus.