Understanding Crater Edge
The ecological dead zone beyond the playable crater, patrolled by adult Ghost Leviathans.
This is an original reference for the first Subnautica. Your current depth rating, oxygen, available tools and navigation route determine when an objective is practical. Follow actual in-game PDA and Fabricator information for any values that vary by version.
How to use this information
Turn back toward the crater when the PDA indicates ecological dead zone.
What to avoid
It is not a hidden new biome with a completion reward.