It's so damn interesting (morbidly interesting, I'd say) to see people with thalassophobia playing the game.
This dude, Beelz, cannot venture into more open areas. Curiously enough, there are no sharks there (as we know them). There are literally no sharks swimming and roaming around in the red grass biome. On Earth, sure, there's a blue void you need to watch out for in 3D.
In the game, high is safe above the red grass. 1/