Understanding Do Not Fight Every Leviathan
Evading predators is usually safer than prolonged combat.
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
Use sound cues, terrain and vehicle movement to avoid their patrol paths.
What to avoid
Trying to defeat a Reaper has little value for normal completion.