Subnautica drops you alone on an alien ocean planet after your spaceship crashes, and what follows is one of the best survival games ever made. The game masterfully creates fear through depth — the deeper you dive, the darker it gets, the more dangerous the creatures become, and the more incredible the discoveries are. There are no guns (by deliberate design choice), forcing you to rely on evasion, tools, and vehicles to survive. The story unfolds organically through radio signals, data logs, and environmental storytelling, guiding you ever deeper toward answers about the planet, the alien disease you've contracted, and how to escape. Nearly every player remembers their first encounter with a Reaper Leviathan.
Starting Subnautica can feel overwhelming. This guide tells you exactly what to focus on during your first hours so you don't waste time on things that don't matter yet.
What Kind of Game Is This?
Subnautica is a survival game built around base building and vehicle crafting. The core loop involves mastering these systems to progress through increasingly challenging content.
What to expect: Time investment in learning mechanics, experimentation, and gradual mastery. The game rewards patience and knowledge.
Choosing Your First Build
| Build | Beginner Rating | Why |
|---|---|---|
| Seamoth Explorer | Good (but demanding) | Use the Seamoth as your primary exploration vehicle for everything above 900m. Park it outside dangerous areas and swim in when needed. The speed lets you outrun most threats. |
| PRAWN Miner | Good (but demanding) | Walk along the ocean floor in deep zones, drill large resource deposits, and use the grapple arm for rapid traversal. The PRAWN tanks hits that would destroy the Seamoth. |
| Cyclops Captain | Excellent for beginners | Use the Cyclops as your mobile operating base for deep expeditions. Deploy PRAWN for resource gathering, retreat inside for crafting and storage, and use silent running near leviathans. |
| Base Builder | Situational | Build bases in each major biome, use scanner rooms to locate resources, and create a network of supply stations connected by vehicle transit routes. |
| Speedrunner | Situational | Memorize blueprint locations, grab only what you need, skip vehicle construction, and use the Seaglide and upgraded oxygen tanks to reach endgame areas directly. |
Our recommendation: Start with PRAWN Miner. The PRAWN Suit is essential for deep-water zones (900-1700m) and resource gathering. Its drill arm mines large resource deposits 10x faster than the knife, and the grapple arm lets you swing across caverns like Spider-Man. In the Lava Zone, the PRAWN is the safest way to move because it can tank hits from Sea Dragon Leviathans.
Avoid Speedrunner as your first pick. Speedrunning Subnautica involves beelining to blueprint locations, grabbing only essential resources, and racing to the endgame rocket.
First Session Step-by-Step
Step 1: Learn base building
Bases are constructed from modular pieces: I-compartments, T-compartments, multipurpose rooms, and glass observatories. Each piece affects hull integrity — go negative and your base floods. Reinforcements and foundations add integrity. Bases require power from solar panels (surface), thermal plants (near heat vents), bioreactors, or nuclear reactors. Bases enable crafting, storage, vehicle docking, and scanner rooms.
This is the foundation. Spend your first 15-30 minutes getting comfortable with how base building works before worrying about anything else.
Step 2: Head to Safe Shallows
The starting biome directly around your lifepod. Shallow water (0-40m) with abundant basic resources and harmless fish. This is where you build your first base, craft basic tools, and learn game mechanics. No predators except the occasional Gasopod at the edges.
Clear the main content here before moving on. Everything teaches fundamentals you'll need later.
Step 3: Get Your First Upgrade
Look for Stasis Rifle — it's the most accessible early upgrade. Fires an energy bubble that freezes any creature in place for 20-30 seconds. Essential for scanning aggressive creatures like Stalkers and Bonesharks safely. Against Leviathans, the Stasis Rifle buys enough time to repair your vehicle or swim away. Does not work on the Sea Dragon.
Step 4: Understand vehicle crafting
Three vehicles unlock progression: the Seamoth (fast, 200-900m depth), the PRAWN Suit (walking mech, 900-1700m, drill arms for mining), and the Cyclops (massive submarine, mobile base, 500-1700m). Each is built at the Mobile Vehicle Bay using blueprints scattered across the ocean. Depth modules upgrade their crush depth limits.
This is the system most new players overlook. Invest time here early — it pays off throughout the entire game.
Step 5: Push to Kelp Forest
Dense kelp forests surrounding the Safe Shallows with Stalkers (aggressive shark-like predators) that collect metal salvage. Stalkers drop their teeth when biting metal — Stalker Teeth are needed for Enameled Glass. The Kelp Forest has Creepvine (silicone rubber) and Silver Ore in sandstone outcrops.
Essential Mechanics Explained
base building
Bases are constructed from modular pieces: I-compartments, T-compartments, multipurpose rooms, and glass observatories. Each piece affects hull integrity — go negative and your base floods. Reinforcements and foundations add integrity. Bases require power from solar panels (surface), thermal plants (near heat vents), bioreactors, or nuclear reactors. Bases enable crafting, storage, vehicle docking, and scanner rooms.
vehicle crafting
Three vehicles unlock progression: the Seamoth (fast, 200-900m depth), the PRAWN Suit (walking mech, 900-1700m, drill arms for mining), and the Cyclops (massive submarine, mobile base, 500-1700m). Each is built at the Mobile Vehicle Bay using blueprints scattered across the ocean. Depth modules upgrade their crush depth limits.
depth progression
The ocean is layered by depth: 0-100m is safe and bright, 100-300m introduces moderate predators, 300-900m has dangerous biomes and leviathans, and 900-1700m contains the most dangerous creatures and the story's climax. Depth naturally gates progression since vehicles need upgraded depth modules and you need better equipment to survive.
scanner room
A base-mounted room that scans the surrounding area (300m+ range when upgraded) for specific resources. You select what to scan for and the room highlights their locations on your HUD. Scanner Room HUD chips let you see scan results while away from base. This eliminates aimless resource searching and is essential mid-game.
alien research
Scattered alien facilities contain data entries, ion cubes, and blueprints for advanced technology. The main story threads through three alien bases that explain the planet's history, the Kharaa bacterium, and the Sea Emperor Leviathan. Completing the alien research storyline is required to cure the disease and build the escape rocket.
Common Beginner Mistakes
1. Going to the Aurora wreck before crafting a Radiation Suit — radiation kills you slowly and you'll die before reaching the useful areas inside the ship
2. Building your base too deep or in a biome with aggressive predators — the Safe Shallows and Grassy Plateaus are the best base locations for a first playthrough
3. Ignoring the radio messages and trying to explore randomly — the radio provides critical story breadcrumbs and map markers that guide natural progression
4. Trying to fight Leviathans with the knife — the game is designed around avoidance, not combat
A Reaper Leviathan has 5000 HP and your knife does 20 damage.
5. Not building a Seamoth as soon as possible — swimming everywhere wastes oxygen and puts you at constant predator risk
The Seamoth should be your first major crafting goal.
First 5 Hours Checklist
- Understand base building and vehicle crafting
- Choose PRAWN Miner as starting build
- Clear Safe Shallows main content
- Acquire Stasis Rifle or equivalent upgrade
- Reach Kelp Forest
- The radio in your lifepod broadcasts messages on a timer — always respond to radio calls because they mark key locations on your map and drive the story forward.
- Drop Beacons at every important location — wreck sites, resource deposits, cave entrances, and base locations. Beacons are cheap to craft and prevent you from losing discovered locations.
Tips for New Players
- The radio in your lifepod broadcasts messages on a timer — always respond to radio calls because they mark key locations on your map and drive the story forward.
- Drop Beacons at every important location — wreck sites, resource deposits, cave entrances, and base locations. Beacons are cheap to craft and prevent you from losing discovered locations.
- The Scanner Room with 4 Range Upgrades covers a 500m radius and finds any resource type. Build one in a central location to eliminate all resource-searching frustration.
- The Cyclops in Silent Running mode is nearly undetectable by Leviathans. Keep it in slow speed and silent running when traversing dangerous areas like the Lost River or Lava Zone.
- Reaper Leviathans can be avoided by hugging the ocean floor and moving slowly. They detect motion and sound — if you hear a roar, stop moving and they may lose interest.
- Alien Containment (the big fish tank) in your base lets you breed fish infinitely. Put two of the same species in and they reproduce. This solves food and water problems permanently.
- The Thermal Plant generates unlimited free power near any heat source (lava vents, hot springs). Build one near volcanic areas for permanent base power without fuel.
- PRAWN Suit grapple arm + drill arm is the endgame combo. Grapple to walls and ceilings for mobility, drill Large Resource Deposits for massive yields of gold, lithium, and other deep-sea materials.
- Carry a Repair Tool at all times. Vehicle damage accumulates and a hull breach means flooding and eventual destruction. Repair your Seamoth and Cyclops after every creature encounter.
- The game has no map — you must navigate by landmarks, beacons, and compass heading. The Aurora wreck is always to the east, and key biomes are in fixed positions relative to it.
Frequently Asked Questions
Is Subnautica scary?
Yes, genuinely. The game triggers thalassophobia (fear of deep water) better than any horror game. The ocean gets darker as you descend, creatures get larger and more aggressive, and sound design makes every distant roar terrifying. Many players report genuine anxiety during deep dives, especially encountering Reaper Leviathans for the first time.
How long does it take to beat Subnautica?
A focused first playthrough takes 25-35 hours. Completionists scanning every creature and building elaborate bases can spend 50-70 hours. The game doesn't rush you — many players spend hours just exploring and base building before touching the main story.
Can you kill Leviathans in Subnautica?
Technically yes, but it takes over 100 Thermoblade hits or dozens of gas pods. The developers intentionally excluded lethal weapons to reinforce the theme of coexisting with the ecosystem. The Stasis Rifle freezes them temporarily for escape. Most players learn to avoid Leviathan patrol routes rather than fight.
Is Subnautica multiplayer?
No, Subnautica is single-player only. The developers stated that multiplayer would compromise the isolation and atmosphere that makes the game special. A fan-made multiplayer mod called Nitrox exists but is unofficial. Subnautica: Below Zero is also single-player.
What to Read Next
- Subnautica Builds — Optimize your build once you've learned the basics
- Subnautica Walkthrough — Full progression path
- Subnautica Tips — Advanced strategies for when you're ready
