Subnautica 2 Starter Guide: Essential Tips, Early Biomods & Hidden Locations

I've restarted Subnautica 2 four times now. Once because I soft-locked myself. Once because I wanted to try a different Biomod path. Twice because the game updated and I wanted to experience the new content fresh. Through those restarts I've optimized the early game down to a science.

This is the stuff that isn't in any tutorial. The shortcuts. The hidden locations. The decisions that matter in the first five hours.

The Real First Priority (It's Not What You Think)

Everyone says build the Scanner first. They're right. But what they don't tell you is what to scan. The game throws dozens of scannable objects at you immediately. Most are decorative. Some unlock nothing.

The fragments you actually need in hour one: Habitat Builder fragments near the larger Cicada wreckage, Propulsion Pack fragments scattered around the Shallows, and Mobile Constructor Bay fragments that spawn near the debris field at roughly 80 meters depth. Everything else can wait.

Scanning a fragment that unlocks a mid-game recipe you can't craft yet is wasted time. Be selective.

I made this mistake hard. Scanned every piece of debris I found in the first hour. Got twelve blueprints. Could build maybe three of them. The clutter in my crafting menu actively made it harder to find the recipes I actually needed.

The Hidden Wreck at 120 Meters

East of the starting Shallows, follow the ridge down to about 120 meters. You'll see a section of the Cicada's hull embedded in the rock face. There's a small gap in the hull that you can swim through. Inside is a data terminal with a log from one of the original colonists. Reading it adds a waypoint to your PDA.

The waypoint leads to a resource cache. Nothing game-breaking. Some titanium ingots, a couple batteries, a pre-crafted Beacon. But at hour two those supplies save you about 45 minutes of gathering. I hit this wreck on every new run now.

The catch: a juvenile Snapjaw nests near the entrance. It's not dangerous but it's loud and startling in the enclosed space. Approach slowly and it usually swims off.

The Biomod That Changes Early Game

Most guides will tell you to get Bioluminescent Vision first. They're right. But your second Biomod is a real decision and most people get it wrong.

Enhanced Grip Strength, from scanning the rock-crawling arthropods in the Reef Shelf, doubles resource yields from outcropping nodes. This sounds minor. It is not minor. Over a playthrough, this Biomod saves you literal hours of resource grinding. Every limestone node drops 4-6 titanium instead of 2-3. Every sandstone node drops 3-4 gold instead of 1-2.

Get this second. Not Pressure Adaptation. Not anything defensive. The resource acceleration compounds across the entire game. The earlier you get it, the more value it generates.

The Reef Shelf is at about 200 meters. You can reach it safely with a basic O2 Tank and Fins. The arthropods you need to scan are on the rock walls. They're skittish, they'll run if you approach fast. Swim slowly.

Tadpole Timing Is Everything

There's a window between hour three and hour six where the Tadpole feels like a revelation. If you get it in that window, the game's pacing is perfect. You're ready for deeper biomes, you have Beacons marking interesting locations, and the Tadpole opens up everything.

Get it before hour three and you haven't explored enough on foot to appreciate it. Get it after hour eight and you've spent five hours swimming everywhere, hating your life, wondering why the game feels so slow.

I hit it at hour four on my best run. Had the Constructor Bay fragments scanned by hour two, gathered materials during hour three, built the Tadpole mid-hour four. That's the sweet spot.

Base Location: The One Spot Worth Building At

I've built bases in four different locations across my playthroughs. Only one location was good. The rest were mistakes.

The best spot: the Shallows near the central thermal fissure. Roughly 80 meters depth. There's a flat plateau with a heat vent at one end and a clear view of the surrounding terrain. Solar panels work here. Thermal Plants work when you unlock them. You're two minutes from the Vine Tangle border. Five minutes from the Reef Shelf. Central enough that no expedition point is more than a ten-minute Tadpole ride.

Don't build in the Vine Tangle. The Stalker-equivalents there are relentless and they'll attack your base. Don't build in the Fungal Basin yet. The environmental hazards make base maintenance a chore. Don't build in the Trench. Just don't.

Co-op Considerations

If you're playing with friends, someone needs to rush the base while someone else rushes the Tadpole. Don't both do the same thing. Parallelize.

The player who builds the base should focus on the Habitat Builder and storage. The player building the Tadpole should focus on the Constructor Bay and gathering vehicle materials. You'll have a functional base and a Tadpole by hour three instead of hour five.

Split Biomod specializations early. One person goes utility (Bioluminescent Vision, Enhanced Grip Strength). The other goes defensive (Pressure Adaptation, eventually Electric Discharge). You cover more ground when you're not both running the same build.

Communication is harder than it seems. Beacons are per-player. Your teammate can't see your markers. Use distinctive landmarks when giving directions. "Near the coral arch with the purple growth" works. "Near my Beacon labeled cave3" means nothing.

What I Still Don't Know

The game is Early Access. Some things are genuinely unclear. The full Biomod tree hasn't been datamined yet. The Void's content is clearly incomplete. The Axum storyline stops at an obvious cliffhanger point. The Crafton and Unknown Worlds have been good about updates so far but there's no roadmap with dates.

If you're the type who needs a complete experience, maybe wait for 1.0. If you're okay with a game that's 70% done and fascinating, jump in. I don't regret my 40 hours even knowing the story doesn't have an ending yet.

The underwater survival formula is still unmatched. The co-op adds a dimension the first game never had. And the Biomod system, even incomplete, is genuinely innovative. It makes scanning feel rewarding in a way I've never experienced in another survival game.