Subnautica: Beginner's Guide & Best Tips

Introduction – Why This Game Will Ruin Other Games for You

Alright, listen. I've got about 800 hours in this goddamn water planet, and I still get the heebie-jeebies when I hear a Reaper roar in the distance. Subnautica isn't just a survival game – it's a horror game dressed up in bioluminescent coral and tropical fish. You start thinking you're just building a nice little underwater base, crafting some fins, and then the ocean floor drops away into black nothing and you realize you're not even close to the bottom.

I bought this game on a whim during a Steam sale, expecting some janky Early Access mess. Instead, I got a game that made me actually afraid of the dark. Not jump scares – real, primal fear of what's swimming in the abyss. And then, after 20 hours, the fear turns into wonder. You learn the map. You learn the creatures' patrol routes. You become the apex predator, and let me tell you, there's no gaming high like punching a Boneshark in the face with a Prawn suit and stealing its eggs.

But it's not perfect. The inventory management is a nightmare in the early game. The Seamoth is made of tissue paper. And the game never tells you that you can repair your lifepod with the repair tool – I spent my first two hours swimming around a leaking pod wondering why I was drowning in my own base. This guide is to save you from that specific brand of stupid.

Getting Started / First Steps – Don't Be Like Me

First things first: your lifepod is not your home. It's a deathtrap that slowly floods and has zero storage. Here's what you do in the first 15 minutes that I wish someone screamed at me through my headset:

• Scavenge the kelp forest. Right outside your pod, there's a biome with tall green stalks. Swim into the stalk crevices – you'll find Creepvine Seed Clusters. These are your ticket to lubricant and silicone rubber, which you need for a proper O2 tank and fins. Grab at least 6.
• Build a Repair Tool immediately. The blueprint is already in your PDA. You need 1 Silicone Rubber, 1 Titanium, 1 Cave Sulfur. The sulfur comes from those floating gas pods in the Safe Shallows caves – the ones that shoot acid at you. Grab the glowing yellow ball after the pod explodes. Yes, you'll take damage. Do it anyway.
• Don't build the radiation suit first. Everyone panics about the Aurora radiation leak. It takes 3 in-game days to spread to your pod. Use that time to build a Seaglide and a High Capacity O2 Tank. The radiation suit is a waste of precious inventory slots until you're actually going near the wreck.
• Eat the fish. You don't need a thermoblade for the first 5 hours. Catch Peepers with your hands (they're slow) and cook them in the fabricator. Raw fish gives you like 5 food. Cooked gives 27. Always cook.

Core Mechanics & Progression – How the Game Actually Works

Subnautica's progression gate is depth, not levels. You don't grind XP – you grind blueprints and materials to go deeper. The game locks story progression behind certain depth thresholds, and the only way to survive is to build better subs and suits. Here's the real priority list:

• Step 1: Seaglide + High Capacity Tank. This combo lets you explore the Grassy Plateaus (the red grass areas) and the kelp forest without dying to oxygen anxiety. You can get the seaglide blueprint in the safe shallows wrecks – look for the scrapped pieces near the big metal boxes.
• Step 2: Seamoth. This is your car. Not a tank – a compact car with a 2-star safety rating. It maxes out at 220m depth stock. You'll need to find the Moonpool blueprint (usually in the Underwater Islands or Grand Reef) to upgrade it. The Seamoth is great for the first half of the game, but don't get attached – it will die.
• Step 3: The Laser Cutter and Propulsion Cannon. These open doors in wrecks. The Laser Cutter requires 1 Battery, 1 Diamond, 1 Titanium. Diamond is found in the Shale Outcrops of the Jellyshroom Caves or Underwater Islands. The Propulsion Cannon is a meme weapon, but it's required to access certain databoxes. Don't skip it.
• Step 4: The Prawn Suit. This is the true progression. It's slow, clunky, and has the turning radius of a container ship, but it can go 900m deep stock and punch Leviathans in the jaw. The grapple arm is mandatory – you become Spider-Man in an ocean of horrors. Build this before you even think about the Cyclops.
• Step 5: Cyclops (optional but recommended). I hate the Cyclops. It's a big, slow, fragile submarine that attracts every creature in the area. But you need it to craft the Shield Generator and the Thermal Reactor Module. Use it as a mobile base, not an exploration vehicle. Park it at 400m depth and take the Prawn out for excursions.

The story progresses through radio signals and PDA logs. Always answer the radio. It leads you to lifepods, which have wrecks nearby with blueprints. If you ever get stuck, go deeper. The answer is always deeper. The Lava Lakes are at 1300m. You'll need a Prawn with a Thermal Reactor to survive down there comfortably.

Expert Tips & Tricks – The Stuff You Learn Bleeding

Here's the stuff that separates the "I drowned in the Jellyshroom Caves" crowd from the "I punched a Sea Dragon and stole its baby" crowd.

• Air Pumps are worthless. I built a network of air pipes in my first playthrough, thinking it'd let me explore deeper caves. It doesn't work – the pump only provides air at the surface, and the pipes break if you look at them wrong. Just use a Series II Tank or build a bunch of small oxygen bases with a hatch, a solar panel, and a fabricator.
• Stalkers love metal salvage. If you drop a piece of metal salvage near a Stalker, it'll grab it and swim around. A few seconds later, it'll drop a Stalker Tooth. This is how you get enameled glass. Tame a Stalker by dropping fish near it, then drop salvage. You'll have 10 teeth in 2 minutes.
• The Seamoth Perimeter Defense system is broken. It costs 20% energy per zap, but it instantly stops a Reaper grab animation. I once zapped a Reaper three times and it just left. It's the single best upgrade for a Seamoth. Do not go to the Dunes without it.
• Grow your own food. Build a Marblemelon planter in your Cyclops or base. One melon gives +8 food and +8 water. Plant four and you never need to hunt again. The Bulbo Tree is also good – 2 water per bite, infinite food. But Marblemelons are King.
• The Prawn Suit can survive a direct Sea Dragon hit. If you're in the Prawn and a Dragon lands on you, spam the punch buttons. You'll take damage, but you won't explode. I survived a fall from 800m to 200m once because I landed on a sand dune. The suit took 60% damage. The fall speed cap is real.
• Scan EVERYTHING. Those big floating jellyfish? Scan them. Those weird glowing plants? Scan them. You get blueprints for stuff you didn't know existed. The Thermal Plant blueprint comes from scanning a specific vent in the Inactive Lava Zone. Miss it, and you're stuck with nuclear power forever.

Advanced Pitfalls – Don't Build Your Base Here

Look, everyone builds their first base in the Safe Shallows. It's fine. It's boring, but fine. Here's what you shouldn't do:

• Don't build in the Kelp Forest. Those Stalkers will constantly grab your exterior lights and drag them into their nests. You'll spend 30 minutes a day retrieving your floodlights. Build on the edge of the Grassy Plateaus instead – safe, central, and pretty.
• Don't build the Cyclops before you have the Prawn. I thought a big base would be the ultimate. It's not. It's a target. Without the Prawn to defend it, you'll just watch it get mauled by a Ghost Leviathan.
• Don't ignore the Deep Grand Reef. There's a cache of blueprints there that includes the Ultra High Capacity Tank and the Drill Arm. Go at 500m depth with a Seamoth that has a depth upgrade. Bring a laser cutter and a repair tool. The crabsquids will emp your Seamoth – stay out of their line of sight.
• Don't carry your entire inventory into deep caves. I lost a full Prawn suit and 40 minerals because I fell into a ravine in the Lost River. The suit clipped through the map. I had to reload a save from 2 hours earlier. Save often. Like, every 15 minutes. The game has autosave, but it's unreliable and usually puts you 45 minutes back.

FAQ – The Questions Nobody Asks, But Should

Q: What's the fastest way to get titanium?
A: Go to the Grassy Plateaus and break Limestone Outcrops. Each one gives 1 titanium. I can get 30 in 5 minutes just swimming around the big red grass hills. Or salvage metal from the kelp forest – each piece gives 4 titanium. The Aurora's interior also has piles of scrap.

Q: I'm stuck at 500m depth. How do I go deeper?
A: You need the Prawn Suit Depth Module MK1. It's in the Grand Reef wreck at about 350m. Bring a laser cutter and a propulsion cannon. The MK2 is in the Lost River, near the Disease Research Facility. The MK3 is in the Lava Castle. Depth is always gated by story progression – keep reading your PDA.

Q: Is the Reaper leviathan killable?
A: Yes, with the Prawn suit and a drill arm. It takes 45-60 seconds of continuous drilling on the head. It'll scream and shake. You'll feel like a god. But the game doesn't reward you for it – the Reaper just despawns and respawns after a few minutes. It's more fun to just avoid them. They guard the back of the Aurora and the Dunes. Respect the noise.

Q: What's the point of the Cuddlefish?
A: It's a pet. It follows you. It makes cute noises. You can hatch it from an egg found in the Deep Lilypads Cave. It does nothing for gameplay. I had one named "Bubbles" that I accidentally left in a base that got flooded. I spent an hour swimming through a wreck to get it back. Worth it.

Q: The game says "Detecting multiple leviathan class lifeforms." Am I in danger?
A: That's the PDA's polite way of saying "You're in the Dunes or the Mountains biome, and a Reaper is about to eat your face." Turn around slowly. If you see sand dunes and a lot of rib bones, you're in Reaper territory. Leave. Unless you're endgame and have a stasis rifle – then go hunting.

Q: Best base location?
A: The Lost River tree cove. It's at 560m, right before the entrance to the Lava Zones. It has thermal vents for power, it's safe from all predators (the Ghost Leviathan won't enter the cove), and it's central to endgame resources. I build a small base there with a bed, a fabricator, and a battery charger. It's my home away from home.

Q: How do I use the stasis rifle effectively?
A: Charge it fully (hold the trigger) and shoot the ground in front of the creature, not at it. The bubble expands and freezes everything inside. A fully charged shot lasts 30 seconds on a Reaper. That's enough time to scan it or drill it. I once froze a Reaper, scanned it, and then watched it swim away. It didn't even attack me after. Weird mechanic, but useful.