With three people, you can clear an entire island in two minutes. This is a double-edged sword; you will strip the Pacific bare.
The mod is available through Nexus Mods and dedicated Stranded Deep modding Discord communities. Search for “Stranded Deep Multiplayer Mod” or “Stranded Deep Co-op Mod” – the 3-player version is often labeled as such. Always scan files with antivirus software and back up your save data before installing. stranded deep 3 players mod
Many players ask, "Why do we need a mod? Why doesn't the developer just add 3-player co-op?" Core systems to implement:
The developer, Beam Team Games, built Stranded Deep from the ground up as a single-player simulation. The physics (especially the interaction between physics objects like oars and rafts) are tied to the "master client." Adding two more master clients creates exponential math problems. Tools/mod frameworks: likely use BepInEx, uMod, or Harmony
The official "Co-op" on PS4/Xbox is split-screen only because the console forces both players to share one screen's data. True online multiplayer would require rebuilding the engine.
The Stranded Deep 3 Players Mod is a duct-tape miracle. It is ugly, fragile, and beautiful.