Subnautica 2 has officially arrived in Early Access, bringing one of the community’s most requested features to the alien depths: full online multiplayer. Whether you're looking to dive into the bioluminescent waters of a new planet with a veteran crew or just want a hand gathering resources, we’ve got you covered. This guide breaks down exactly how to host a session, how to convert your existing single-player saves into co-op worlds, and the specific steps required to get crossplay working between different platforms. Mastering the Subnautica 2 co-op experience is essential for survival in this massive open-world underwater sequel. From generating 8-digit invite codes for cross-platform play to understanding how shared Scanner Stations and respawn bio pods affect your team's efficiency, knowing these mechanics will keep your squad from drowning in the details. As Unknown Worlds expands the game through its Early Access roadmap, we’ll continue to provide the latest tips on resource management, base building, and navigating the deepest biomes without the restriction of player tethers.