Extraterrestrial Locations

-This page documents extraterrestrial locations mentioned within the *Subnautica* series, including *Subnautica*, *Subnautica: Below Zero*, and *Subnautica 2*, which do not appear as playable environments in the games themselves.+This page documents extraterrestrial locations mentioned within the Subnautica series (Subnautica, Subnautica: Below Zero, and Subnautica 2) which do not appear as playable environments in the games themselves. These locations provide context for the broader universe, including the origins of certain technologies, creatures, and historical events.   ## Eido-Thea System-The Eido-Thea system is the star system in which *Subnautica 2* takes place. In addition to the planets Proteus and Apiary, the system contains six other planets and two moons.+The Eido-Thea system is the star system in which Subnautica 2 takes place. In addition to the main planets Proteus and Apiary, the system contains six other planets and two moons.   ## Alpha671-Alpha671 is a planet mentioned in *Subnautica: Below Zero* upon fabricating a Booster Tank:+Alpha671 is a planet mentioned in *Subnautica: Below Zero* upon fabricating a Booster Tank. The databank entry states: > "Equipped with only a booster tank, Dr. Felicity Aman once escaped the underwater acid tentacle forest on planet Alpha671."   The planet apparently hosts an aquatic, likely predatory lifeform known as **Acid Tentacles**, which grow in large numbers.   ## Apostikar Apostikar is mentioned in *Subnautica: Below Zero* in the databank entry for the Architect Body. The nature of the location is unknown, but it is within human-explored space and hosts a native lifeform known as the **Putty Serpent**.   ## Boreal 9 Boreal 9 is a planet mentioned twice in *Subnautica* and alluded to in *Subnautica 2*. The survivalist Craig McGill apparently once survived a crash-landing here. The planet features acid swamps.  -It is most known for the recurring "Arachnid Kidney Poachers" (or simply "Kidney Poachers"), a possibly intelligent, though not technological species mentioned in both *Subnautica* and *Subnautica 2*.+It is most known for the recurring "Arachnid Kidney Poachers" (or simply "Kidney Poachers"), a possibly intelligent, though non-technological species mentioned in both *Subnautica* and *Subnautica 2*.   ## Byzantos-5-Byzantos-5 is mentioned by Robin Ayou in *Subnautica: Below Zero*. Robin apparently survived here for three months using a knife, some rope, and her lucky PDA. Almost nothing else is known about the location.+Byzantos-5 is mentioned by Robin Ayou in *Subnautica: Below Zero*. Robin apparently survived here for three months using only a knife, some rope, and her lucky PDA. Almost nothing else is known about the location.   ## Caltwale Prime Caltwale Prime is mentioned in *Subnautica: Below Zero* in the databank entry for the Architect Body. It hosts a lifeform known as the **Chromium Boar**, which has apparently become invasive on multiple worlds.   ## Deltar-6 ![Iriane's postcard featuring a city on Deltar-6](wiki-images/4c/4cf51b1b0f1046a13fcbb1f2abe4c503.png)   Deltar-6 is a human-inhabited location mentioned in *Subnautica: Below Zero*. Vinh Pham's partner, Iriane, had recently begun living there and sent Vinh a postcard, which can be found in the Omega Base.  -A mentioned area of Deltar-6 is the **Chirizain desert**, which has black sand. A human city built from pale brown stone, situated between two carved cliff faces over the black sandy banks of a river, can be seen in the postcard.+A mentioned area of Deltar-6 is the **Chirizain desert**, which has black sand. The postcard depicts a human city built from pale brown stone, situated between two carved cliff faces over the black sandy banks of a river.   ## Freya IV-Freya IV is a moon mentioned in *Natural Selection 2*. It is the site of the mining facility "Neo-Caligo" and a colony which would become known as "Colony Zero". Freya IV potentially represents the origin point of the Kharaa outbreak.+Freya IV is a moon mentioned in *Natural Selection 2*. It is the site of the mining facility "Neo-Caligo" and a colony known as "Colony Zero". Freya IV potentially represents the origin point of the Kharaa outbreak.   ## Hera Hera is a planet featured in *Natural Selection*. Located on the outskirts of the Ariadne Arm, this electrical storm-wracked planet is named for its similarity to Mars, though it is apparently much larger.   -There are two major habitat complexes known as **Rhea** and **Cronus**, as well as numerous smaller stations including Station 16-B, the site of the *Natural Selection* map "ns_hera". The colony was overtaken by Kharaa at some point and was one of the first sites the TSF attempted to push back on.+There are two major habitat complexes known as **Rhea** and **Cronus**, as well as numerous smaller stations including Station 16-B (the site of the *Natural Selection* map "ns_hera"). The colony was overtaken by Kharaa at some point and was one of the first sites the TSF attempted to push back on.   ## Holt's Asteroid Holt's Asteroid is mentioned in *Subnautica: Below Zero* in the databank entry for the Architect Body. It possibly represents the real asteroid [4435 Holt](https://en.wikipedia.org/wiki/4435_Holt). It hosts an organism known simply as **giant geckos**.   ## Lithton Lithton is mentioned in *Subnautica: Below Zero* in the databank entry for the Architect Body. It hosts an organism known as the **electrode eel**.   ## Mardon-14 Mardon-14 is mentioned in *Subnautica: Below Zero* in the databank entry for the Architect Body. It is a planet with multiple moons. The moons are host to an organism known as the **astral ray**. Given that the rays can be found on multiple moons, it is possible these rays are a spacefaring organism.   ## New Tārā New Tārā was the site of a Mongolian one-way colony where Mogami Kinu formerly lived. It is highly probable that the world became overtaken by the Kharaa Bacterium, leading to Mogami fleeing.   ## Nyos Nyos is mentioned in the profile of Rauli Isotalo. Isotalo was apparently the sole survivor of an expedition to Nyos.   ## Obraxis Prime Obraxis Prime is a location mentioned in *Subnautica* when the player crafts the Survival Knife. It was apparently the site of a massacre after a group of survivors on the planet fabricated weaponry from their survival blueprints. This event led to the removal of weaponry from standard survival blueprints, with the exception of the Survival Knife.   ## Olympion Olympion is mentioned in *Subnautica: Below Zero* in the databank entry for the Architect Body. It is a mountainous planet and home to an organism known as **shaggy goats**.   ## Rakshasa Rakshasa is mentioned in *Subnautica 2*. The atmosphere of Rakshasa contains organolead compounds which resulted in the deaths of an entire expedition, save for Rauli Isotalo. Melaku Sansar was amongst the dead; however, his blackbox was retrieved by Isotalo, allowing him to be reprinted. This event is cited as a key reason for the creation of the Biolab.   ## Sado Island Asteroid Field The Sado Island Asteroid Field is a location in *Natural Selection 2*. The map "Caged" takes place onboard a Japanese vessel named the 02883 here. The asteroid field is named for the real [Sado Island](https://en.wikipedia.org/wiki/Sado_Island).   ## Sanjei Station Sanjei Station is a Mongolian-controlled space station mentioned in *Subnautica*. The Aurora refuelled at the station prior to reaching 4546b.   ## Strader VI-Strader VI is a location mentioned in *Subnautica*. It is home to a kind of colony-forming hive-minded organism that is the focus of the databank entry "What Can We Learn From the Hive Mind of Strader VI".+Strader VI is a location mentioned in *Subnautica*. It is home to a kind of colony-forming, hive-minded organism that is the focus of the databank entry "What Can We Learn From the Hive Mind of Strader VI".   ## Terra 17 Terra 17 is mentioned by an Alterra citizen named George in *Subnautica* in a PDA titled "Alterra Citizen Testimonials". It features a controlled habitat in which humans live, though very little is known of it.