Subnautica 2 Axum Ruins Biome Guide

Ancient alien ruins with Celestine — a radioactive resource needed for advanced tech. Bullethead swarms attack in groups; Cerathecan is a large territorial threat. This is not a resource-run biome; it is an expedition zone.

Danger levelVery High ★★★★☆
Depth range80–250m
Fauna recorded16 species
Resources11 types
Last updatedMay 15, 2026
Quick answer: Ancient alien ruins with Celestine — a radioactive resource needed for advanced tech. Bullethead swarms attack in groups; Cerathecan is a large territorial threat. This is not a resource-run biome; it is an expedition zone.

What you will find in Axum Ruins

Every dive into Axum Ruins should have a clear objective. The zone has 16 documented fauna species and 11 harvestable resource types. Plan your inventory before entry: bring enough oxygen for the target depth (80–250m), enough bag space to make the trip worthwhile, and a Beacon to mark your entry point.

Key resources

The following resources are available in Axum Ruins. Prioritise based on your current crafting goals before you dive.

  • Titanium
  • Silver
  • Copper
  • Gold
  • Sulfur
  • Celestine

Passive fauna

These species are not aggressive targets under normal conditions. Some may still react if cornered or disturbed.

  • Locust
  • Electric Geordie
  • Flash Slug
  • Pneuma
  • Hoverthorn

Threats in Axum Ruins

There are 4 predator types recorded in Axum Ruins. Know each one before you dive. A single surprise encounter at depth with low oxygen is fatal.

  • Bullethead — 1000 HP — targets: Player, Tadpole
  • Cerathecan — 1000 HP — targets: Small creature
  • Twin Sitaray
  • Waxmoon — 0 HP — targets: Player
Survival note: The Bullethead attacks in swarms. If you hear rapid movement near a lava tube or tight passage, stop moving and kill all active lights immediately. Noise and light attract the swarm.

When to visit Axum Ruins

Recommended timing: Late game — Celestine requires this zone, bring full equipment.

Axum Ruins contains Celestine, a radioactive material required for late-game tech. You will need to come here eventually. Prepare for Bullethead swarms by travelling quietly and avoiding tight passages without a clear exit.

Check your gear before entering this zone:

  • Oxygen: enough for the full depth range (80–250m), plus a return buffer
  • Inventory: cleared to hold collected resources
  • Beacon: placed at your entry point
  • Return trigger: agreed before you dive (e.g. "turn around at 40% oxygen")
Early Access note: Spawn positions, resource counts, and creature behaviour are active targets for adjustment in the May 2026 build. This page will be updated as the community verifies data.

How to plan a Axum Ruins route

Axum Ruins should be treated as a route choice, not just a named zone. Before you enter, decide whether you are going there for resources, fragments, scouting, a base decision, or a creature scan. Each goal changes what you should bring and how long you should stay.

The current page lists this biome with danger level Very High ★★★★☆, depth information of varied depth, and visit timing around after preparation. Use those notes to decide whether this is a first-contact scouting run or a proper farming route. If the biome is new to you, do not try to collect everything on the first visit.

Resource run strategy

If your target is materials, enter Axum Ruins with empty storage and a strict shopping list. The biggest mistake players make in a resource biome is collecting random items until the inventory is full, then realizing they did not bring home the material needed for the next tool, base module, or vehicle step.

Use this biome as part of a loop: leave from a known safe point, gather only the highest-priority materials, return before the route becomes stressful, and craft immediately after you arrive home. If 11 types are listed as important here, connect those materials to actual recipes before farming large quantities.

  • First run: scout landmarks, oxygen pressure, and threat positions.
  • Second run: gather a focused set of materials.
  • Third run: return only if the biome supports a clear upgrade, fragment, or base goal.

Threat routing

A biome’s danger is not only about the creatures inside it. Terrain, visibility, vertical movement, and distance from safety can be just as important. If the page lists threats such as local threats, plan the route so you can leave without passing directly through the worst part of the habitat.

Do not let a single resource node, fragment, or glowing landmark pull you deeper than your equipment supports. Subnautica 2 works best when you learn a dangerous biome in layers. Approach the edge, memorize exits, return to base, then come back with the right tool, vehicle, or co-op plan.

Base and return planning

Not every biome is a good base location. A useful base needs more than a beautiful view: it needs safe entry routes, reasonable resource access, enough room to expand, and a return path that stays readable when visibility drops or a predator pushes you off course.

If you are considering building near Axum Ruins, first test the route several times without carrying critical materials. Watch how often you get disoriented, whether threats patrol near likely entrances, and whether the zone supports the kind of crafting or exploration you plan to do next. A temporary outpost can be better than committing to a main base too early.

Co-op route plan

Co-op crews should split jobs before entering Axum Ruins. One player scouts, one gathers materials, one watches threats and return direction, and one manages storage or vehicle safety. This prevents the group from wasting time on duplicate tasks and keeps the team from losing orientation when a creature appears.

If the biome feels too dangerous, leave together. A common co-op mistake is letting one player push ahead while the others are still looting or scanning. Treat the return call as a team decision, not a personal preference. A full-crew retreat with useful information is better than a messy rescue attempt.

Early Access note

Biomes can change during Early Access. Resource density, fragment placement, creature behavior, and route safety may be adjusted after updates. If your current save does not match this page, check the patch notes and treat the information as a starting point rather than an unchangeable map.

The safest way to use this guide is to combine it with observation. If the biome feels more dangerous than described, pull back and re-plan. If the rewards feel different, update your route goal. The best Subnautica 2 players adapt to the current build instead of forcing an old plan into a changed ocean.

Frequently Asked Questions

Is Axum Ruins safe for beginners?

Axum Ruins has a danger rating of Very High. It is not recommended for first sessions. Build survival gear first, then explore with a clear return route planned.

What is the most valuable resource in Axum Ruins?

The highest-priority resources in Axum Ruins are Titanium, Silver, Copper. Celestine is the rarest and most valuable here — needed for advanced tech.

What predators are in Axum Ruins?

Recorded predators: Bullethead, Cerathecan, Twin Sitaray, Waxmoon. Bullethead attacks in swarms — avoid noise and stay near cover.

What depth is Axum Ruins?

Axum Ruins spans approximately 80–250m. Plan oxygen capacity for the deeper areas and set a return trigger before diving below 80 metres.