Survivor Incognito / Sector Zero

Subnautica: Below Zero · 2D Terrain Atlas

Source-derived terrain, simplified 2D underground survey views, searchable landmarks and in-game coordinates.

Sector Zero — terrain map

Terrain and nearby-depth voxel references.

Region

Tap a marker · pinch to zoom

200 m

Reading the atlas

The relief image shows the uppermost detected solid voxel at each sampled column. It is not a safe travel-depth chart, and roofs can hide caves below.

Map icons represent locations with published coordinates. When using near-depth views, markers more than 200 m above or below the selected depth are hidden from the map (but remain searchable). Coordinates are reference points, not precise building outlines or routes. Cave entrances and story sites may contain spoilers. The starting Drop Pod has several possible spawn positions, so this atlas does not place a misleading fixed marker.

Map display

Terrain depth reference

Depth bands highlight voxel surfaces within roughly 90 m of a chosen depth. They do not identify traversable tunnels.

Go to game coordinates

Enter X and Z from your in-game position. The map can identify the source biome at that column, but it cannot determine your Y depth.

Select a map point or enter X and Z. Y is unknown unless measured in-game.

Show source biome names on the map

Labels use the supplied biome raster, not the underground cave names.

Find a location

Selected location

Select a symbol or choose a result to see published reference coordinates and a short description.

About this build · sources and limitations

This is an unofficial Survivor Incognito Below Zero atlas. Phase 11 adds an optional simplified 2D structural overview for Crystal Caves and Fabricator Caverns alongside the original inspectable voxel traces. Phase 10 improved mobile cave-map readability by moving cave location names from the artwork into touch-friendly, spoiler-aware reference buttons, reducing visual clutter without altering source-derived terrain coordinates. Phase 7 added published western land-region references and a paired-cave entrance guide (not surveyed travel paths), fixes a northwest/southwest wording error, and flags the contradictory Glacial Connection exit coordinates. Phase 6 added exact 4 m-resolution biome identification at X/Z coordinates using an RLE encoding of the original user-supplied biomeMap.bin, plus optional major-biome map labels. The reported category belongs to the biome raster column, not a guaranteed current cave, floor depth or safe route. Its two deep-region 2D cave maps combine signed-distance wall samples from 25 m-spaced horizontal planes between Y -400 and -1050 m. The chart styling improves the visibility of sampled wall boundaries without claiming continuous passages or traversable routes. The terrain relief comes from the uploaded CompiledOctreesCache voxel archive and is projected onto a four-metre horizontal grid. The coloured biome layer comes from the uploaded biomeMap.bin, with names from biomes.csv. The orientation was checked against known in-game coordinates.

Projection takes the uppermost detected solid voxel, which may be a cave roof, ice or cliff rather than the accessible seafloor. Near-depth overlays show sampled voxel features within approximately 90 m above or below the selected depth, over dimmed uppermost-terrain artwork. Phase 4 also provides separate true horizontal samples at Y -400, -500, -650, -750, -850 and -950 m, classifying octree leaf voxels as empty, solid, ambiguous or absent. These plane samples do not reveal full 3D connections, animated objects or route safety. They are not true cutaway maps, cave floorplans or navigable route diagrams. Some voxel cache areas remain incomplete; missing or flat regions should not be interpreted as safe open water. In the Fabricator Caverns, the supplied surface biome raster labels part of the recorded deep terrain as World Edge. Near-depth terrain evidence is therefore drawn from connected voxel samples close to the published Fabricator Base coordinate, but no surrounding tunnel route has been inferred. The biome raster classifies the surface region and does not provide distinct labels for all deep cave biomes. The underground connection guide uses published wiki descriptions to establish region-level links, not source-derived cave corridors. Its step order is conceptual and is not safe navigation guidance.

Landmark coordinates are from public community references, not extracted from these three source files, and should be treated as approximate. Particularly deep story locations and cave entrances need in-game verification. No external map artwork has been copied.

References: Unknown Worlds terrain documentation · Sector Zero coordinate listings · Mercury II wreck locations.

Public beta · Phase 11 · 2D terrain atlas with simplified cave overviews and source traces, biome inspector and coordinate references · source-derived terrain · embedded artwork works offline once saved.