Platform decision
Pick the ecosystem that matches how you plan to play. Steam is the clearest PC spec reference, Xbox and PC Game Pass are useful if you already subscribe, and Epic is another PC storefront option.
A compact planning page for the public Early Access details that are already confirmed: platform choice, system checks, co-op expectations, and a conservative first-session plan.
Pick the ecosystem that matches how you plan to play. Steam is the clearest PC spec reference, Xbox and PC Game Pass are useful if you already subscribe, and Epic is another PC storefront option.
Treat the first run as a mapping session. Learn the safe loop, scan nearby objects, build a small storage rhythm, and return before oxygen pressure turns into lost progress.
Four-player online co-op works best when the group agrees on roles before everyone scatters. Assign one navigator, one storage owner, and one player watching emergency supplies.
Subnautica 2 is still in Early Access planning territory, so this site should be useful without filling gaps with guesses.