Where to Find Ruby in Subnautica: Below Zero
Ruby is likeliest in Tree Spires (about 138 spawns per new game there). Most modelled spawns lie between -693 m and -247 m (negative is below sea level), and the files pin 2 fixed spots on the map.
Data: Subnautica: Below Zero game files (build of 12 Aug 2025), read and drawn by PinDrop. (c) Unknown Worlds Entertainment. PinDrop is fan-made and not affiliated with Unknown Worlds Entertainment.
Where to find Ruby: areas ranked
Top 5 areas by expected spawns per new game, then the share of that area's spawn slots that can hold ruby.
- Expected spawns per game
- 356
- Fixed pins in the files
- 2
- Depth band (metres)
10%: -693 m · median: -447 m · 90%: -247 m
| Rank | Area | Share of area slots | Chance per eligible slot | Expected per game |
|---|---|---|---|---|
| 1 | Tree Spires | 3.4% | 3.8% | 138 |
| 2 | Crystal Caverns | 6.1% | 2.5% | 117 |
| 3 | Lily Pads | 0.7% | 5.4% | 66.6 |
| 4 | Arctic Caldera | 26% | 1.9% | 19.3 |
| 5 | Koppa Mining Site | 11% | 1.6% | 14.7 |
A model read from the game's code and data (EntitySlot spawner tables, 921,892 baked slots), not verified in a running game; it shows where a resource CAN spawn, not where it is in your save.
How Ruby appears
| Name in the game | Form | File id |
|---|---|---|
| Ruby | Item you pick up | AluminumOxide |
The fixed outcrop pins say they are mined with: Prawn suit drill arm. Outcrop and item forms come from the spawn-table ids (Breakable, Drillable, or the item itself).
Fixed ruby pins (2)
Objects the files place at set coordinates. Depth in metres: negative is below sea level. Each row opens that pin on the full map.
| Pin | Area | Depth (m) | Position | Map |
|---|---|---|---|---|
| Ruby (drillable) | Delta Island | -272 | x -180, z -735 | Show on map |
| Ruby (drillable) | Purple Vents | -328 | x -76, z -629 | Show on map |
What Ruby is used in
5 named recipes in the game files use ruby as an ingredient.
Aerogelneeds 1 · Fabricator, Seatruck Fabricator Module
Prawn suit depth module MK1needs 3 · Fabricator, Seamoth upgrades, Seatruck Fabricator Module
Seatruck Depth Upgrade MK2needs 2 · Modification station
Seatruck Perimeter Defense Upgradeneeds 2 · Fabricator, Seamoth upgrades, Seatruck Fabricator Module
Synthetic fibersneeds 1 · Fabricator, Seatruck Fabricator Module
All recipes are on the crafting page.
About Ruby in Subnautica: Below Zero
Ruby has 5 areas in the spawn model, led by Tree Spires with about 138 expected spawns per new game. In the model 10% of its spawns lie deeper than -693 m and 10% shallower than -247 m, with the median at -447 m (negative is below sea level). The game files also place 2 fixed pins, listed above.
The chance model is built from the game's own spawn tables, so it shows where ruby can appear, not where it sits in your save. For the other ores see the resource chance table; blueprints that unlock recipes are on the blueprints page.
A model read from the game's code and data (EntitySlot spawner tables, 921,892 baked slots), not verified in a running game; it shows where a resource CAN spawn, not where it is in your save.