Quick answer
Look for Atacamite around lower-depth Alien Ruins routes after you have the Tadpole Depth Module. PC Gamer reports a strong cluster east-northeast of the Alien Ruins Research Base, near alien dwellings and quartz nodes. Save it for Mangalloy before you treat it like spare mineral stock.
Route notes
Start from the Alien Ruins Research Base
Current reporting points to Atacamite around the Alien Ruins route. Use the Research Base as the landmark so the dive can be repeated.
Prepare for lower-depth mining
PC Gamer places Atacamite below the comfortable early-game layer, around deeper Alien Ruins areas, so bring the Tadpole Depth Module before treating this as a farming route.
Look for dark green column-like crystals
Atacamite nodes are visually distinct. Once you find a cluster, mine it with the Sonic Resonator and note the route for later Mangalloy crafting.
Do not leave with only one sample
Atacamite feeds Mangalloy Ingots, Metal Farm planning, and later power-plant progression, so gather a buffer when the route is safe.
Pair it with Troilite planning
Mangalloy asks you to think about Atacamite and Troilite together. If you find Atacamite first, mark the route and check whether the Troilite trip is already on your next dive list.
Why Atacamite matters
| Use | Planning note |
|---|---|
| Mangalloy Ingots | Atacamite is one of the rare inputs reported for Mangalloy Ingot crafting. |
| Metal Farm chain | A Metal Farm requires a Mangalloy Ingot, so Atacamite indirectly gates rare-metal production. |
| Alien Power Plant | PC Gamer reports that later repair work can require multiple Mangalloy Ingots, making Atacamite worth stockpiling. |
| Route mapping | Because this sits deeper than early materials, a repeatable route matters more than a one-off find. |
Safe farming rule
Treat Atacamite as a planned mining trip, not a casual pickup. If you have already reached the Alien Ruins safely, gather enough for several Mangalloy crafts before leaving, then update your resource storage so you do not accidentally spend all of it.
Field notes
Mark the way home before mining
The Atacamite cluster is not useful if you cannot repeat the dive. Drop a beacon or write the route from the Research Base before filling your inventory.
Bring a real mining loadout
This is not a swim-by pickup. Treat it like a Sonic Resonator trip with depth, power, storage, and return timing solved before you leave base.
Keep Atacamite and Troilite together in storage
Mangalloy planning gets messy when the two rare inputs live in different lockers. Put them in one marked rare-metal box and avoid surprise co-op spending.
FAQ
Where do you find Atacamite in Subnautica 2?
Current route reporting points toward lower-depth Alien Ruins areas. PC Gamer describes a cluster east-northeast of the Alien Ruins Research Base, near alien dwellings and quartz nodes.
What do you need before farming Atacamite?
Bring the Tadpole Depth Module, Sonic Resonator, oxygen margin, and a way to mark the route. Treat it as a deeper mining trip, not a quick swim.
What is Atacamite used for?
Atacamite is one of the rare inputs reported for Mangalloy Ingot crafting, which then connects to Metal Farms and later alien-system work.
Should you farm extra Atacamite?
Yes, if the route is safe. Mangalloy and Metal Farm planning can use more than a single sample, and returning to the same deep route repeatedly wastes time.