Crater Edge

The Crater Edge, also known as the Void, is the area surrounding the main crater in Subnautica. With no resources and extreme danger, this zone serves as the border for the game's map.

Ghost Leviathan in the Void

Warning: Entering ecological dead zone. Adding report to databank.

― PDA, Dialogue

Overview

Subnautica takes place inside the Crater of an enormous, dormant, aquatic volcano, approximately two kilometers in diameter. The Crater Edge acts as the perimeter for this environment.

Key Characteristics:

Type: Dead Zone
Depth Range: 0 - 8192 meters
Temperature Range: 10.2°C - 11.5°C
Music: Ahead Slow
Flora/Corals: None
Fauna: Adult Ghost Leviathans only (non-microscopic)

Gameplay Mechanics

Adult Ghost Leviathans live in the Crater Edge, deterring players from straying outside the playable area. When entering the biome:

A single Ghost Leviathan spawns immediately.
If the player stays in the area for 40 seconds, a second Ghost Leviathan spawns.
Staying for another 40 seconds spawns a third and final Ghost Leviathan.

These creatures will pursue the player until they return to the playable area, at which point all Ghost Leviathans retreat.

Description

The Crater Edge is a large open ocean devoid of any flora, coral, and all but one non-microscopic fauna species. The edges of the playable area stretch downwards to a depth of 1120 meters on most ends. Underneath the Inactive Lava Zone and Lava Lakes, the map stretches farther to 1920 meters.

Once the player travels 8,192 meters in any direction, they reach the farthest reachable point. Beyond this limit, the player and any piloted vehicle are teleported back to a random location 10 meters above sea level, up to 250 meters from the map center.

At approximately 4,000 horizontal meters from the map center, the "void" biome effectively ends according to the game logic. Here, Adult Ghost Leviathans cease spawning and retreat, leaving only empty ocean as the true end of the game's limits.

In lore, the subaquatic volcano is thought to reach a depth of ~3000 to ~4000 meters, where the real ocean floor (abyssal plain) begins. Prior to the Big Little Update, terrain resembling this abyssal plain existed at the bottom of the Crater Edge at around 3000 meters depth.

Data Bank Entry

Geological scans of this area show a steep decline in all directions. This data is consistent with the theory that the Aurora crashed on the edge of a 2km x 2km volcanic crater. It has likely been millennia since an eruption reached the surface, encouraging the ecosystem within the crater to flourish.

The ecology of the trench surrounding the crater supports only two kinds of life: microscopic, and leviathan class. Exploration is ill-advised.

Gallery

Drop off into the Crater Edge from the Grand Reef

The Crater Edge drop off from the Mountains

Edge of the Crash Zone

The massive drop off into the Crater Edge from the Bulb Zone

The terrain at the bottom of the Crater Edge prior to the Big Little Update

A Ghost Leviathan in the Crater Edge

Trivia

The PDA refers to the Crater Edge as an “ecological dead zone,” though this is technically incorrect as it supports enough planktonic life to sustain huge filter feeders. Real-world oceanic dead zones are hypoxic and unable to sustain life.
Despite fan usage, "Dead Zone" is not the official name; the capitalization in the PDA dialogue indicates it is a description rather than a title.
Before the Big Little Update, the Crater Edge had realistic terrain at 3000 meters depth, featuring a flat 4km x 4km square area representing the crater bottom. This was removed likely due to rendering constraints.
Sea Dragon Leviathans, Reaper Leviathans, and Crabsquids were planned to spawn here but the idea was scrapped.
The Crater Edge was originally called "The Void" or "The Dead Zone."
It is the deepest biome in the game.
It is one of only two biomes without flora (the other being the Lava Lakes).
The terrain extends beyond 8192 meters, but this cannot be viewed without bugs or mods.
Huge peaks of unfinished terrain previously existed before the void, part of early developer experiments. These were removed in Update 8 (January 15, 2015).
It is the only biome present in both Subnautica and Subnautica: Below Zero.

Bugs

Screen Shaking: Swimming very far out causes violent screen shaking, likely due to floating-point errors preventing accurate location calculation.
Console Crash: On consoles, the game may crash upon reaching 3000 meters depth, though this is less frequent now.
Teleportation Glitch: If the player is above water when passing 8196 meters in any direction, they stop moving, fall slowly, and are teleported back to the playable area upon hitting the water. This also applies to crossing the vertical 8196-meter barrier.