Understanding Reaper Leviathan
A large hostile predator often associated with dangerous zones such as the Aurora vicinity and Dunes.
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
Listen for its roar, keep a broad escape route and avoid using the Seamoth as an invulnerable shield.
What to avoid
Trying to fight a Reaper for resources is unnecessary for normal story completion.