Hardcore Mode

A hardcore mode where everything including your environment and other features are punishing as part of the gameplay. This would include such as creatures doing overall more damage, Oxygen depleting at an faster rate, vehicles cannot be repaired/broken completely so you’d have to remake them like in the original subnautica. Adding extra features like your bases need to reinforced and also losing your inventory except tooks upon death. This would make the gameplay and the challenges you face have more difficulty and be more enjoyable to those who like things like that.