If you’ve beaten both Subnautica and Below Zero and found yourself scratching your head at how different the two worlds look, you’re not alone. You’re not the first player to ask if Subnautica 1 and 2 are on the same planet, and it’s a question that sparks tons of debate in community threads even years after both games launched. I’ve replayed both titles three times each, dug through every hidden PDA entry, and even cross-referenced dev interviews to pull together a full, canon answer to this common lore question. This guide breaks down all the clues, explains why the worlds feel so different, and what the shared setting means for the future of the franchise.
Core Lore Answer: Is Subnautica 1 and 2 on the same planet?
The short, confirmed canon answer is yes, both Subnautica (the original 2018 game) and Subnautica Below Zero (the 2021 sequel) are set on the same exoplanet, designated 4546B by the Alterra Corporation. Both games take place in completely separate regions of the planet, thousands of kilometers apart from each other, which is why so many players assume they’re on different worlds at first glance. The original game is set in a warm, equatorial volcanic crater, while Below Zero unfolds in the planet’s frozen southern polar region.
Devs have confirmed this connection multiple times in post-launch interviews, and it’s baked into nearly every piece of lore you can find in both games. The events of the first game directly set up the state of the world in Below Zero, from the reduced Kharaa bacterium levels to the presence of small Alterra research outposts scattered across the arctic biome. If you’ve ever found a random PDA in Below Zero referencing the Aurora crash, that’s not a random Easter egg—it’s a direct nod to the shared planet setting.
Key Lore Clues That Confirm The Shared Planet
You don’t have to take dev comments at face value to confirm the shared setting, either. There are dozens of in-game clues spread across both titles that tie the two worlds together, if you know where to look. Some of the most obvious and undeniable confirms include:
- PDA entries in Below Zero that reference the Aurora crash and Ryley Robinson, the original game’s protagonist, who successfully cured the Kharaa outbreak and escaped the planet 10 years before the events of Below Zero
- Shared flora and fauna across both games, including peepers, bladderfish, stalkers, and even Leviathan-class organisms that have adapted to both warm and cold biomes on the same planet
- Identical Precursor architecture and technology found in both regions, from alien data terminals to supply caches left by the ancient alien species that once occupied 4546B
- Alterra operational logs that explicitly note 4546B has a wide range of habitable biomes across different latitudes, from tropical equatorial zones to frozen polar regions, both of which were marked for resource extraction before the Aurora crash
One of the biggest and hardest to miss confirms is the presence of the Kharaa bacterium in both games. The frozen Leviathan you spend most of Below Zero investigating was infected with the exact same strain of Kharaa that caused the planetary outbreak in the original Subnautica. The enzyme 42 cure Ryley released at the end of the first game spread across the entire planet, which is why Kharaa levels are drastically lower in Below Zero and you don’t have to constantly manage infection levels like you did in the original. That direct narrative throughline is impossible to explain if the two games were set on separate planets.
Why The Two Game Worlds Feel So Unrecognizable From Each Other
If they’re on the same planet, why do the two games look and feel so different? There are two simple explanations that cover almost all the noticeable differences between the two settings. The first is location: the original Subnautica is set right on 4546B’s equator, inside a massive active volcanic crater. Geothermal activity in the equatorial crater keeps water temperatures at a consistent 20-30C year round, supporting lush coral reefs, dense kelp forests, and the wide range of warm-water sea life you encounter in the first game.
Below Zero, by contrast, is set in the planet’s southern polar region, where average surface temperatures hover well below freezing for most of the year. The only open water you find is either kept liquid by deep geothermal vents, or seasonal melt zones that freeze over during the planet’s long winter cycles. Most of the life in the arctic region has adapted to cold temperatures, with thick blubber, antifreeze proteins, or other traits that make them look slightly different from their equatorial cousins, even if they’re the same species. If you’re still skeptical that Subnautica 1 and 2 are on the same planet, try comparing the day/night cycle length in both games—they’re exactly the same, a small detail the devs added to confirm the shared planetary rotation.
The second big difference is the timeline. Below Zero takes place 10 full years after the events of the original Subnautica. In that decade, Alterra has sent multiple survey teams to 4546B, set up small research outposts, and begun preliminary resource extraction operations in the less dangerous arctic region. You won’t find the wreckage of the Aurora in Below Zero, because it crashed thousands of kilometers away in the equatorial crater, but you will find plenty of references to the crash and the changes it brought to Alterra’s operational plans for the planet.
What The Shared Planet Setting Means For Future Subnautica Games
The fact that both games are set on 4546B opens up a ton of possibilities for future entries in the franchise, and devs have already teased that there are dozens of other biomes on the planet that haven’t been explored in any released title. We’ve already seen hints of floating atmospheric islands, deep ocean trenches far deeper than the ones in the original game, and even terrestrial biomes with large land-dwelling creatures that haven’t made an appearance in either released game.
All future Subnautica titles set on 4546B will tie back to the lore established in the first two games, which means we could see references to Ryley’s escape, the Kharaa cure, Alterra’s ongoing mining operations, or even surviving Precursor technology in any new releases. Devs have also hinted that we might get to see other regions of the planet that were affected by the Kharaa outbreak in different ways, leading to entirely new gameplay loops and survival challenges that we haven’t seen in the first two games.
For now, there’s no confirmed release date for the next Subnautica title, but the shared planet setting makes it clear that the franchise isn’t done with 4546B yet. If you’re a lore fan, it’s worth replaying both games to pick up on the small, easy to miss clues that tie the two settings together, from throwaway PDA lines to shared creature behaviors that you might not have noticed on your first playthrough.
At the end of the day, there’s no room for debate when it comes to whether is Subnautica 1 and 2 on the same planet, with both in-game lore and dev comments confirming the shared 4546B setting. The drastic differences between the two worlds are just a testament to how diverse and well thought out the planet’s lore is, and how much effort the dev team put into building a living, breathing exoplanet with a wide range of biomes to explore. Next time you boot up either game, keep an eye out for the small cross-game Easter eggs—they make the entire franchise feel much more connected and immersive.
