Crater Edge

Subnautica takes place inside The Crater of an enormous, dormant, aquatic volcano, two kilometers in diameter. The Crater Edge is the area surrounding this crater. With no resources and extreme danger, the zone serves as a border for the game's map.

Three adult Ghost Leviathans live in the Crater Edge, where they deter players from straying outside of the playable area. Up to three Ghost Leviathans can appear at once, only losing interest when the player leaves the zone. If the player enters the Crater Edge, a single Ghost Leviathan spawns in. If the player stays in the Crater Edge for thirty seconds, a second Ghost Leviathan will spawn. If the player stays in the area for another thirty seconds, a third and final Ghost Leviathan spawns in. They will all pursue the player until the player returns to the playable area, upon which they will all retreat.

The Crater Edge stretches down to 1120 meters before cutting off into a seemingly infinite drop. After 8,192 meters depth, the player (as well as any vehicle being piloted) teleports back to the surface. At approximately 4000 horizontal meters away from the map center, the zone ends. Leviathans cease spawning and there is only empty ocean, acting as the real end of the game's limit.

Description
The Crater Edge is a large open ocean devoid of any flora, coral, and all but one fauna species.

The edges of the playable area, the Crater, stretches downwards to a depth of 1120 meters. At that point, the world cuts off on most ends. Underneath the Inactive Lava Zone and Active Lava Zone the map stretches farther to 1920 meters.

Once the player has gone 8,192 meters in any direction, the player reaches the farthest reachable point of the Crater Edge. Beyond this point, the player will be teleported back to a randomly chosen location that is 10 meters above sea level and up to 250 meters away from the center of the map.

Fauna=
 * Ghost Leviathan

Trivia

 * Before the Big Little Update, Crater Edge used to have unfinished terrain at around 3000 meters depth. The bottom of the Crater was found here, which was a flat area that covered about a 2km x 2km. At 3040 meters depth the world cut off.
 * Sea Dragon Leviathans, Reaper Leviathans, and other fauna were planned to spawn in the Crater Edge at one point, but this idea was scrapped.
 * The Crater Edge was originally called The Void and the Dead Zone.
 * The Crater Edge is the deepest biome in the game.
 * The Crater Edge is one of the two biomes that do not harbor flora, the other being the Lava Lakes.

Bugs

 * When swimming very far out from the playable area, the player's screen will appear to shake violently. This is likely caused by floating point errors, meaning that the game is unable to accurately calculate the player's location.
 * PS undefined Only on consoles, the game crashes upon reaching 3000 meters in depth. The reason is unknown, but is somewhat consistent.