Extraterrestrial Locations

Extraterrestrial Locations are locations in the universe that are not of Earth, such as other planets, moons or space stations. This page serves as a list of known stations and orbital bodies in the Subnautica universe.

4546
4546 is a star system located in the Ariadne Arm with at least 11 orbital bodies larger than Earth's moon. The system is outside of federation space and is therefore not owned by any Trans-Govs but is also not unexplored. One of these bodies is Planet 4546B, which is slightly smaller than Earth and is an ocean planet with a breathable atmosphere and great biodiversity. The planet is also host to a sapient form of life, the Sea Emperor Leviathan, as well as the non-native Architects.

4546B System
4546B is known to have 2 moons orbiting close to the planet, one of which periodically causes solar eclipses.

Auwell
Auwell is an independent planetary research colony that supports life. The only mentioned form of native life on Auwell is the Auwellian toadworm and some form of leaf-bearing plant.

Auwell is the planet where Robin Ayou, Sam Ayou, and their mother moved to when Robin was five years old. The colony was eventually shut down due to an accident that resulted in their mother's death.

Boreal 9
Boreal 9 is a planet characterized by its acid swamps. It is mentioned by the PDA in Subnautica as motivational note. Known native life forms include arachnid kidney-poachers, tree-roaches and egg-laying starwals, as well as a host of plant life such as stankroot. Because there are "tame starwhals" on the planet, it can be inferred that Boreal 9 was civilized or at least inhabited by humans. The planet is notorious for being a location of Craig McGill's adventures.

Byzantos-5
Byzantos-5 is a planet where Xenoworx had Robin Ayou survive with limited resources.

Deltar-6
Deltar-6 is the planet that Vinh Pham's girlfriend Iriane mentioned on Vinh's Postcard.

Obraxis Prime
Obraxis Prime is a planet mentioned by the PDA in Subnautica. Little is known about it, except that it is infamous for a massacre which resulted in the removal of weapons from standard fabricators (with the exception of the Survival Knife).

Scott III
Scott III is a Mongolian-controlled planet. Due to the presence of a Xeno Prospecting division, it can be assumed that the planet sustained life. At one point in her career, Robin Ayou worked on this planet, though it's unclear what she worked as.

Strader VI
Strader VI is an Alterra-controlled planet that was found to harbor a sentient, hivemind-forming life form. The discovery of this life form made the planet an important point in the field of biology, considering scientists stayed on the planet to research for at least two decades. Robin Ayou worked on this planet as a xeno-researcher for a large part of her life.

Terra 17
Terra 17 is a largely civilized Alterra-controlled planet. Little is known about the planet save that Alterra has set up controlled habitats on it for its citizens, implying the planet may not be naturally habitable.

City-Station 749
City-Station 749 is an Alterra-controlled space station. The name implies it is about the size of a modern-day city. The station is known to possess Alterra-oriented schools. It is the location in which Sam Ayou and Robin Ayou were born.

Sanjei Station
Sanjei Station is an Mongolian-controlled space station. Due to the way Second Officer Keen refers to it, it can be assumed that the Aurora crew took advantage of the hospitality of the Sanjei inhabitants, acquiring free refueling and food in return for searching for the Degasi, a task they never intended to complete.

Vesper Station
Vesper Station was an orbital station that was used by Alterra to monitor Planet 4546B and possibly other astronomical bodies like 4546B's moons. It was also responsible for salvaging the wreckage of the Aurora. The Vesper was later cut with the introduction of the new story after the Frostbite update.

Prawn Suit poster planet (land)
This Prawn Suit poster seems to represent a planet different to 4546B, but it's not known if this is a planet previously mentioned, or another separate one.

Prawn Suit poster planet (sea)
This Prawn Suit poster portrays an ocean in the background, but judging by the organisms in the background, it's not on 4546B.

Mercury II background planet
The poster for the Mercury II shows a planet in the background. Nothing is known about this planet other than it exists, and was visited by the Mercury II. It could possibly be territory of the Sol-Trans Gov.

Architect Relics Origin Planets
Many relics can be found in the Primary Containment Facility and Quarantine Enforcement Platform, one of which being of human origin. It is not known if the other relics were from other planets or created by the architects.

Potato's Planet
A picture frame of Robin Ayou's pet cat Potato shows a planet similar to Earth containing similar flora.

Trivia

 * "Obraxis Prime" and "Strader VI" are references to Subnautica developers Scott "Obraxis" Macdonald and Cory Strader. "Scott III" may also be a reference to Scott Macdonald or another Subnautica developer, Scott Thunelius.