Potentially the most useful creature addition to Subnautica, Sea Treaders provide a multitude of resources. These creatures spawn rocks that can be broken apart for resources. We're still working on the exact formula regarding what resources and how often, but it's safe to say that you'll want to locate these from time to time. Alternatively, you can pick up their poop for bio reactor fuel. The graceful giants of Subnautica do more than walk around magestically.