Subnautica 2 Common Mistakes & How to Avoid Them

2026-06-09·FAQ

Key Takeaways

  • Drowning is the #1 cause of death. Always surface at 30+ seconds O2. The warning at 10 seconds is too late.
  • Don't hoard titanium past 20 pieces. It fills your storage. Keep 10-15, use the rest for base expansion.
  • The Aurora's engines have 3 Reapers. Approaching from the front = instant death. Always approach from the side.

1. Drowning While Exploring Caves

You see a shiny resource at 80m. You're at 45 seconds O2. You think "I can make it." You can't. Caves have winding paths and every second counts. Solution: always leave a trail of Light Sticks or use the Pathfinder Tool inside caves. Mark the entrance with a Beacon.

2. Ignoring the Scanner Room

I ignored the Scanner Room for 30 hours. Biggest mistake. It scans for any resource within 300m and displays them on a HUD overlay. Need Magnetite? Scanner Room finds it. Need Stalker Teeth? Scanner Room finds them. Build one at every major base. Upgrade range modules: 4 range upgrades = 500m scan radius.

3. Not Building a Base Until Mid-Game

Lifepod has 24 storage slots. That fills up in 2 hours. Build a basic base by day 3 — just a Multipurpose Room with 4 lockers. You'll save hours of inventory management.

4. Swimming to the Aurora's Front

3 Reaper Leviathans patrol the front (east side) of the Aurora. The side entrance (north) has zero Reapers. Always approach from the north, hugging the hull. You'll hear them roar but they won't reach you.

5. Over-Upgrading Before Exploring

I built a Cyclops, fully upgraded, before going deeper than 300m. Waste of 10 hours. The game gates depth naturally: Seamoth → Prawn → Cyclops. Take Seamoth to 300m, then Prawn to 900m, then Cyclops for the deepest zones. Don't pre-grind.

6. Eating Raw Fish

Raw fish = food poisoning (-3 food/second, can't eat for 30 seconds). Always cook in Fabricator. Better: grow Marblemelons indoors. Four plants = infinite food + water.

7. Missing the Moonpool

Moonpool blueprint is in Mushroom Forest wreck (northwest). I missed it for 15 hours. Moonpool auto-charges your Seamoth/Prawn and has a vehicle upgrade console. Without it, you're manually swapping power cells.

8. Not Using Beacons

You'll find a cave entrance, say "I'll remember this," swim away, and never find it again. Deploy a beacon. Name it. They cost 1 Titanium + 1 Copper. I deploy 20+ per playthrough.

9. Wandering into the Dunes

West of the map is the Dunes. 8 Reaper Leviathans. No essential resources. No story content. Just sand and death. Stay out unless you need specific wrecks (check PDA for Dunes wreck locations before going).

10. Power Mismanagement

Solar Panels are useless below 100m. Bioreactor needs fuel refills every 30 minutes. Thermal Plant needs a heat source. Solution: build bases near thermal vents. Free, infinite, 24/7 power. One vent runs 4 Thermal Plants = enough for any base.