Troilite is a late-game mineral in Subnautica 2, locked behind both a long swim into the northeastern deep and a specific mining tool. It sits inside Mineralized Clinker, glowing green clusters tucked into an old industrial mining zone past the Angel Comb, well below the Tadpole's stock depth limit.
What you need before the trip
Troilite cannot be hand-picked. The deposit only yields when struck with the Sonic Resonator, and the area sits below 450m, which is past the Tadpole's base crush depth. Without the right tool and a depth module, the run ends in either a dead vehicle or a dead Pioneer.
| Requirement | Why it matters |
|---|---|
| Sonic Resonator | Only tool that breaks Mineralized Clinker, the source of Troilite. |
| Tadpole with Depth Module Mk. 1 | Needed to safely reach the approach to the Troilite zone. |
| Standard or High Capacity Air Tank | You must exit the Tadpole and swim below its crush depth to mine. |
| Free inventory space | The trip is long; round-trips with a full bag waste oxygen. |
| Charged batteries | The Sonic Resonator drains power per hit. |
If the Sonic Resonator is still missing, that recipe needs Lead, two Titanium Ingots, a basic battery, and a wiring kit, so plan a Lead run first.
Route to the Troilite zone
The path starts at the Angel Comb, the large pink bulb structure below the Power Plant. From there, you follow the root system northeast, past the Conduit Crystal pocket, until the water ahead takes on a faint green tint. That glow is the old industrial mining plant where Troilite spawns.
Step 1: Dock at or pass through the Angel Comb area below the Power Plant. Use it as your jumping-off point and, if possible, drop a Beacon here so you can return without retracing the whole route.
Step 2: Follow the roots running northeast. Hook slightly right out of the observatory side to skirt around the Collector Leviathan that patrols the open expanse to the east. Staying close to the root structure keeps you out of its line of sight.
Step 3: Continue past the Conduit Crystal cluster until a green hue appears in the distance. As you close in, the color shifts toward yellow, and a brine-like pool comes into view. That is the Mineralized Clinker field.
Step 4: Park the Tadpole at its safe depth, then exit and swim down. The deposits sit below 450m, so you finish the descent on foot. Watch for hostile fish and crustaceans crowding the pool, and keep the leviathan overhead in mind.
Step 5: Aim the Sonic Resonator at a Mineralized Clinker node and fire. Each broken cluster drops Troilite. There are several nodes scattered through the area, so sweep the pool before returning.
How to confirm you found it
Troilite reads as a green, crystalline mineral and is visible from a distance because the deposits glow. If you are looking at small loose rocks on the seabed, that is not it. The correct target is a larger mound that looks like fused industrial scrap and ore. If the Sonic Resonator hits it and nothing breaks off, you are in the wrong biome or aiming at a different node type.
What Troilite is used for
Troilite feeds the upper crafting tier: power, depth, oxygen, and processed alloys. It is the gate material for several upgrades that unlock the next progression layer past the Angel Comb.
| Recipe | Purpose |
|---|---|
| Entangled Power Cell | Higher-tier power source for vehicles and advanced equipment. |
| Mangalloy Ingot | Processed alloy used in later-tier crafting chains. |
| Photovoltaic Charger | Power component tied to vehicle and base charging. |
| Tadpole Depth Module Mk. 2 | Extends Tadpole crush depth for deeper exploration. |
| Ultra High Capacity Air Tank | Longest oxygen pool for extended dives. |
Because the Photovoltaic Charger also needs Strong Acid, it is worth queuing a Necrolei Cyst run on the same trip plan, so you are not making two long detours for one recipe.
Why mining fails or the resource never appears
| Symptom | Cause | Fix |
|---|---|---|
| Mineralized Clinker won't break | Wrong tool equipped | Use the Sonic Resonator, not the Survival Multitool. |
| Tadpole hull warning before reaching the pool | Missing Depth Module Mk. 1 | Build it at the Modification Station before the run. |
| No green glow on the route | Wrong heading from the Angel Comb | Follow the roots northeast past the Conduit Crystal field. |
| No Troilite drops on hit | Targeting loose rock or unrelated nodes | Aim at the larger glowing clinker mounds only. |
| Constant deaths in the area | Leviathan and aggressive fauna | Approach low along the roots; bring Distraction Flares. |
Once the Sonic Resonator, Tadpole depth upgrade, and route from the Angel Comb are all in place, Troilite stops being a barrier and becomes a planned farming loop. Hit a few clinker nodes, swim back along the same root path, and you have enough material to start clearing the late-game recipe list in one trip.