Under the sea, down where it's wetter, that's where it's better. This is apparently the case for literally millions of players, as Subnautica 2 has already crossed a huge threshold for copies sold, and it's only been in early access one week.
Unknown Worlds, the developer and publisher behind the aquatic survival sequel, has revealed that Subnautica 2 sold over four million copies within five days of launching. Between that and the concurrent players on Steam peaking at over 467,000, it's safe to say the ocean-based adventure is doing well, at least so far.