Introduction
Power is the lifeblood of any underwater base in Subnautica 2. While solar panels and bioreactors work in a pinch, the Thermal Plant offers a reliable, high-output energy source that runs day and night—provided you can reach it. To unlock this blueprint, you must scan two fragments located in a particularly dangerous biome. This guide walks you through every step, from preparation to construction, so you can harness geothermal energy safely.
What You Need
Before venturing out, gather the following equipment and supplies. Missing any item could cut your expedition short.
- Scanner – Mandatory for scanning the fragments.
- Seaglide or Prawn Suit – A fast vehicle to navigate hazardous waters and escape threats.
- Repair Tool – In case your vehicle takes damage.
- Medkits – At least two; the area is home to aggressive fauna.
- Food & Water – Enough for a long trip.
- Knife – For self-defense.
- Beacon – Mark the fragment location for easy return.
- Extra Oxygen Tanks – If swimming without a vehicle.
Step-by-Step Instructions
Step 1: Prepare Your Gear and Vehicle
Head to your base or lifepod and check your inventory. Equip your Scanner and Knife in your toolbar. If using a Prawn Suit, ensure it has a storage module and a grappling arm for maneuverability. For the Seaglide, make sure its battery is fully charged. Pack at least two Medkits, a Beacon, and enough Cured Fish and Filtered Water to last 20 minutes. The Thermal Plant fragments lie in a zone that's deep and hot; consider bringing a Radiation Suit if you're close to volcanic vents.
Step 2: Navigate to the Hazardous Biome
The two fragments sit in a dangerous biome—commonly referred to as the Thermal Spires or Lava Geyser Zone (exact name depends on your game's map). This area is characterized by bubbling vents, high temperatures, and aggressive predators like Bonesharks or Lava Lizards. From your starting spawn, head southwest toward the reddish underwater clouds. Use your Seaglide to descend slowly; watch for sudden temperature spikes on your HUD. The biome starts around 200–300 meters depth. Activate your Beacon at the entrance to mark your path.
Step 3: Locate the Two Fragments
Once inside the Thermal Spires, look for large, rectangular metal plates half-buried in the seafloor or leaning against rock formations. These are the Thermal Plant fragments. They often glow faintly orange due to the heat. Good news: the two pieces are very close to one another—usually within a 50-meter radius. Check around the base of a geyser or inside a small cave. Be wary: the area is patrolled by hostile creatures. Stay vigilant and keep your knife ready. If you have a Prawn Suit, use its drill arm to clear obstructions if a fragment is stuck behind rocks.
Step 4: Scan Both Fragments
Approach the first fragment until the prompt appears. Equip your Scanner and hold the scan button until the progress bar completes—each scan takes about 3 seconds. Do not stop early or you'll have to restart. Immediately after collecting the first data, look for the second fragment. It could be behind a geyser or under an overhang. Scan it the same way. Once both scans are finished, you'll receive the Thermal Plant Blueprint. A notification will appear. At this point, you can leave the biome—no need to linger.
Step 5: Return to Base and Build the Thermal Plant
With the blueprint unlocked, head back to your base using the beacon trail. On a Fabricator, navigate to the Power tab and select Thermal Plant. It requires:
- 2x Titanium
- 1x Magnetite
- 1x Aerogel
Tips for Success
- Use a beeline approach: The Thermal Spires are not a place to sightsee. Get in, scan, and get out.
- Bring a repair tool: Even a small attack from a Boneshark can damage your vehicle. Quick repairs keep you mobile.
- Upgrade your O₂ tank: If you're swimming, a high-capacity tank gives you extra time to scan without surfacing.
- Deploy a beacon: Marking the fragment site helps if you need to return for any reason (e.g., a corrupted scan).
- Watch the temperature: Your suit's health bar will drop if you linger too close to a geyser. Keep moving.
- Consider a second scan: If the blueprint doesn't unlock after two fragments, there may be a third in an adjacent cave. Recheck the area.
With these steps, you'll harness the planet's geothermal power in no time. Stay safe, and happy exploring!