7 Essential Tips for Finding Lithium in Subnautica 2

Lithium is a vital resource in Subnautica 2, used to craft plasteel ingots for upgraded oxygen tanks and essential gear. But tracking it down requires patience and preparation - it only appears in warm waters that will harm you until you unlock the right mutations. This guide lays out everything you need to know, from when to start looking to the best spot to find large deposits. Follow these seven tips and you'll have all the lithium you need for your survival.

1. Wait for Warm Waters - and the Right Mutations

Lithium doesn't appear until you venture into biomes with temperatures above 50°C. Early in the game, those waters cause rapid damage without thermal protection. You'll need to visit a special alien structure to unlock the Thermal Adaptation mutation, which lets you survive in these zones. Don't even bother searching beforehand - focus on gathering other resources first. Once mutated, you'll be ready to explore the warm regions where lithium spawns.

2. The Best Early-Game Location: The Geyser Basin

Your first and most reliable spot for lithium is the Geyser Basin, a shallow area filled with hot vents and rocky outcrops. Look for shiny, grey metallic crystals embedded in the rock walls near the basin floor. Using your scanner room (if built) with a range upgrade helps pinpoint them. Collect at least 8-10 pieces here - this will be enough for your first plasteel ingot and air tank upgrade. The basin is relatively safe; just watch out for nearby lava lizards.

3. Scan for Lithium with the Seaglide Upgraded

Once you have the Seaglide, install the Scanner Module (requires a wiring kit and copper wire). This allows you to highlight resource nodes while swimming. Lithium appears as a distinct golden-brown shimmer on your HUD. Use this to sweep the Geyser Basin and any cave entrances you discover. The module's range is short, so move slowly and systematically.

4. Explore Underground Caves Near Thermal Vents

After collecting surface lithium, dive into the tunnels beneath the Geyser Basin. These caves are rich in lithium deposits but also host aggressive bone sharks. Bring a Repulsion Cannon or stasis rifle to keep them at bay. Look for large, bulbous outcrops on the cave ceilings - they break open easily with the Prawn Suit's drill arm (if you have it). Otherwise, use a knife or propulsion cannon to dislodge them. You'll find 6-10 additional lithium pieces per cave.

5. Craft Plasteel Ingots Efficiently

To make a plasteel ingot, combine 1 Lithium + 2 Titanium in a fabricator. You'll need at least 4 ingots for a high-capacity oxygen tank upgrade. Prioritize building the tank first, as it lets you explore deeper without surfacing constantly. Don't waste lithium on other items until you have that upgrade. Use the Modification Station to further improve the tank's efficiency once you have spare lithium.

6. Avoid the Sparse Arches - It's a Trap

Many players head to the Sparse Arches biome, hoping to find lithium in the massive rock formations. Don't fall for it. The Sparse Arches contain almost no lithium - only common resources like quartz and titanium. Instead, save your oxygen and travel time by sticking to the Geyser Basin and its caves. The Sparse Arches are better suited for late-game materials like kyanite.

7. Expand Your Search Later with the Prawn Suit

Once you build the Prawn Suit with a drill arm and depth module, revisit the deep caves beneath the Geyser Basin. The drill arm extracts lithium three times faster than a knife. Also check the Inactive Lava Zone (once you have the blue tablet) for larger lithium deposits near the castle structure. You'll find clusters of 4-6 pieces in the lava geysers. Just be ready for warpers and lava leeches.

Wrapping Up: Your Lithium Roadmap

Finding lithium in Subnautica 2 is all about timing and location. Start after unlocking the Thermal Adaptation mutation, hit the Geyser Basin first, then explore its caves. Use scanner upgrades to speed things up, and save your lithium for the essential oxygen tank upgrade first. Avoid wasteful trips to empty biomes, and later use the Prawn Suit for bulk mining. With these seven strategies, you'll never be short on lithium again.