Subnautica 2 begins by throwing players straight into its new biological progression system, where survival is no longer just about crafting better gear. Early on, you literally stick your hand into a giant pink organism to gain the ability to breathe highly pressurized air, but the next upgrade you should prioritize is arguably even more important.
At the start of the game, your character suffers from Digestive Incompatibility, which prevents them from properly processing many local food sources. Removing this condition through the Digestion Adaptation is one of the earliest progression milestones, and it dramatically improves survival by letting you safely consume alien proteins and native wildlife.
