Subnautica 2 has sold over one million copies within its first hour and surpassed four million in a week. The game features aggressive alien creatures and implements a no-killing policy, removing the knife from gameplay. Modders have created a combat mod, but an official update (version 1.1) will introduce a stun system that allows players to deter aggressive fish using a sonic resonator. This update will include "stun states" for various creatures, enhancing gameplay while maintaining the game's focus on exploration and survival without violence.