Talk:Survival Knife/@comment-101.182.106.88-20151021215314/@comment-444327-20160928005143

Trello have denounced any possibility of there ever being Multiplayer in the game. They like the idea of Multiplayer in Subnautica but it's not going to happen because it would mean backtracking years of development time, so it's going to stay a single player survival experience.

They are however considering making a spin-off game that would be co-op.

http://forums.unknownworlds.com/discussion/144802/coop-or-multiplayer-in-subnautica-im-afraid-not