Whenever you go outside the map, instead of fatigue, it gets very dark and big sea monsters begin to attack you.
Like seen here. This is what happens when you go outside the map in Subnautica. Sure some people would freak out the first time this happened, but I feel something like this would contribute to making the world feel bigger and more dangerous with much left unexplored.
I came out of the map before but was already been explored by other ppl due to bugs. Was new to me which couldn’t pass the 1 quest, still can’t in nazjatar on the waterfall part where the guy catches you from falling. Once captured by him and once I slowly go down the waterfall which around I say 5 seconds, the bubble goes off and I get shoot out of the map which I did this 3 times which still did same thing. Only part I can’t pass before it bugs again on me. Have the video of it still as well. Probably a common bug that ppl know about.