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Games
Subnautica
#11107
Price: $5.50 USD
Developed and published by Unknown Worlds Entertainment, Subnautica is an underwater open-world survival game set on an alien ocean planet. Players crash-land on the surface and must dive deeper to gather resources, build bases, craft submersibles, and piece together what happened to their ship and the planet beneath them. The game is single-player only, with no combat focus, exploration and survival drive everything.
4.2
610 reviews
87
metacriticDeveloper
Unknown Worlds
Release Date
Jan 22nd, 2018
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PC · Steam
Qty:
$5.50
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Trailer, Artwork & Screenshots (20)
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Description
Subnautica is an underwater adventure game set on an alien ocean planet. A massive, open world full of wonder and peril awaits you!Dive Into a Vast Underwater World
Dive Into a Vast Underwater World
You have crash-landed on an alien ocean world, and the only way to go is down. Subnautica's oceans range from sun drenched shallow coral reefs to treacherous deep-sea trenches, lava fields, and bio-luminescent underwater rivers. Manage your oxygen supply as you explore kelp forests, plateaus, reefs, and winding cave systems. The water teems with life: Some of it helpful, much of it harmful.Scavenge, Craft, and Survive
After crash landing in your Life Pod, the clock is ticking to find water, food, and to develop the equipment you need to explore. Collect resources from the ocean around you. Craft diving gear, lights, habitat modules, and submersibles. Venture deeper and further form to find rarer resources, allowing you to craft more advanced items.Construct Underwater Habitats
Build bases on the sea floor. Choose layouts and components, and manage hull-integrity as depth and pressure increase. Use your base to store resources, park vehicles, and replenish oxygen supplies as you explore the vast ocean.Unravel the Mystery
What happened to this planet? Signs abound that something is not right. What caused you to crash? What is infecting the sea life? Who built the mysterious structures scattered around the ocean? Can you find a way to make it off the planet alive?Disrupt the Food Chain
The ocean teems with life: Use the ecosystem to help you. Lure and distract a threatening creature with a fresh fish, or simply swim as fast as you can to avoid gnashing jaws of roaming predators.Handle the Pressure
Build a Pressure Re-Active Waterproof Nanosuit, or PRAWN Suit, and explore extreme depth and heat. Modify the suit with mining drills, torpedo launchers, propulsion cannons, grappling hooks and more.Fear the Night
As the sun goes down, the predators come out. The ocean is unforgiving of those caught unprepared in the darkness. Areas that are safe to explore during the day become treacherous at night, but also reveal a beauty that those who hide from the darkness will never see.Dive Below the Ocean Floor
Cave systems wind below the sea bed, from dark claustrophobic passages to caverns lit by bio-luminescent life and burning-hot lava flows. Explore the world below the ocean floor, but watch your oxygen levels, and take care to avoid the threats lurking in the darkness.About the Development Team
Subnautica is being created by Unknown Worlds, a small studio founded by Charlie Cleveland and Max McGuire that traces its roots back to the 2003 Half-Life mod Natural Selection. The team is scattered around the globe, from the United States to the United Kingdom, France, the Czech Republic, Russia, Thailand, Australia, and many more places. There is a central office in San Francisco, California that serves as home base for the whole team.
Warning
This game contains flashing lights that may make it unsuitable for people with photosensitive epilepsy or other photosensitive conditions. Player discretion is advised.
After crash landing in your Life Pod, the clock is ticking to find water, food, and to develop the equipment you need to explore. Collect resources from the ocean around you. Craft diving gear, lights, habitat modules, and submersibles. Venture deeper and further form to find rarer resources, allowing you to craft more advanced items.
Construct Underwater Habitats
Build bases on the sea floor. Choose layouts and components, and manage hull-integrity as depth and pressure increase. Use your base to store resources, park vehicles, and replenish oxygen supplies as you explore the vast ocean.Unravel the Mystery
What happened to this planet? Signs abound that something is not right. What caused you to crash? What is infecting the sea life? Who built the mysterious structures scattered around the ocean? Can you find a way to make it off the planet alive?Disrupt the Food Chain
The ocean teems with life: Use the ecosystem to help you. Lure and distract a threatening creature with a fresh fish, or simply swim as fast as you can to avoid gnashing jaws of roaming predators.Handle the Pressure
Build a Pressure Re-Active Waterproof Nanosuit, or PRAWN Suit, and explore extreme depth and heat. Modify the suit with mining drills, torpedo launchers, propulsion cannons, grappling hooks and more.Fear the Night
As the sun goes down, the predators come out. The ocean is unforgiving of those caught unprepared in the darkness. Areas that are safe to explore during the day become treacherous at night, but also reveal a beauty that those who hide from the darkness will never see.Dive Below the Ocean Floor
Cave systems wind below the sea bed, from dark claustrophobic passages to caverns lit by bio-luminescent life and burning-hot lava flows. Explore the world below the ocean floor, but watch your oxygen levels, and take care to avoid the threats lurking in the darkness.About the Development Team
Subnautica is being created by Unknown Worlds, a small studio founded by Charlie Cleveland and Max McGuire that traces its roots back to the 2003 Half-Life mod Natural Selection. The team is scattered around the globe, from the United States to the United Kingdom, France, the Czech Republic, Russia, Thailand, Australia, and many more places. There is a central office in San Francisco, California that serves as home base for the whole team.
Warning
This game contains flashing lights that may make it unsuitable for people with photosensitive epilepsy or other photosensitive conditions. Player discretion is advised.
What happened to this planet? Signs abound that something is not right. What caused you to crash? What is infecting the sea life? Who built the mysterious structures scattered around the ocean? Can you find a way to make it off the planet alive?
Disrupt the Food Chain
The ocean teems with life: Use the ecosystem to help you. Lure and distract a threatening creature with a fresh fish, or simply swim as fast as you can to avoid gnashing jaws of roaming predators.Handle the Pressure
Build a Pressure Re-Active Waterproof Nanosuit, or PRAWN Suit, and explore extreme depth and heat. Modify the suit with mining drills, torpedo launchers, propulsion cannons, grappling hooks and more.Fear the Night
As the sun goes down, the predators come out. The ocean is unforgiving of those caught unprepared in the darkness. Areas that are safe to explore during the day become treacherous at night, but also reveal a beauty that those who hide from the darkness will never see.Dive Below the Ocean Floor
Cave systems wind below the sea bed, from dark claustrophobic passages to caverns lit by bio-luminescent life and burning-hot lava flows. Explore the world below the ocean floor, but watch your oxygen levels, and take care to avoid the threats lurking in the darkness.About the Development Team
Subnautica is being created by Unknown Worlds, a small studio founded by Charlie Cleveland and Max McGuire that traces its roots back to the 2003 Half-Life mod Natural Selection. The team is scattered around the globe, from the United States to the United Kingdom, France, the Czech Republic, Russia, Thailand, Australia, and many more places. There is a central office in San Francisco, California that serves as home base for the whole team.
Warning
This game contains flashing lights that may make it unsuitable for people with photosensitive epilepsy or other photosensitive conditions. Player discretion is advised.
Build a Pressure Re-Active Waterproof Nanosuit, or PRAWN Suit, and explore extreme depth and heat. Modify the suit with mining drills, torpedo launchers, propulsion cannons, grappling hooks and more.
Fear the Night
As the sun goes down, the predators come out. The ocean is unforgiving of those caught unprepared in the darkness. Areas that are safe to explore during the day become treacherous at night, but also reveal a beauty that those who hide from the darkness will never see.Dive Below the Ocean Floor
Cave systems wind below the sea bed, from dark claustrophobic passages to caverns lit by bio-luminescent life and burning-hot lava flows. Explore the world below the ocean floor, but watch your oxygen levels, and take care to avoid the threats lurking in the darkness.About the Development Team
Subnautica is being created by Unknown Worlds, a small studio founded by Charlie Cleveland and Max McGuire that traces its roots back to the 2003 Half-Life mod Natural Selection. The team is scattered around the globe, from the United States to the United Kingdom, France, the Czech Republic, Russia, Thailand, Australia, and many more places. There is a central office in San Francisco, California that serves as home base for the whole team.
Warning
This game contains flashing lights that may make it unsuitable for people with photosensitive epilepsy or other photosensitive conditions. Player discretion is advised.
Cave systems wind below the sea bed, from dark claustrophobic passages to caverns lit by bio-luminescent life and burning-hot lava flows. Explore the world below the ocean floor, but watch your oxygen levels, and take care to avoid the threats lurking in the darkness.
About the Development Team
Subnautica is being created by Unknown Worlds, a small studio founded by Charlie Cleveland and Max McGuire that traces its roots back to the 2003 Half-Life mod Natural Selection. The team is scattered around the globe, from the United States to the United Kingdom, France, the Czech Republic, Russia, Thailand, Australia, and many more places. There is a central office in San Francisco, California that serves as home base for the whole team.
Warning
This game contains flashing lights that may make it unsuitable for people with photosensitive epilepsy or other photosensitive conditions. Player discretion is advised.
This game contains flashing lights that may make it unsuitable for people with photosensitive epilepsy or other photosensitive conditions. Player discretion is advised.
Buy Subnautica Steam Key
Buy Subnautica Steam Key and get instant access to the full game on PC. Your key is delivered instantly to your GameBoost account after purchase, ready to activate through the Steam client, with 3% cashback in GB Coins and 24/7 live chat support on every order. GameBoost is rated Excellent on Trustpilot with over 18,000 reviews. Select your region at checkout to confirm availability. From new releases to classic titles, GameBoost offers all Steam keys on GameBoost across the full range of PC gaming.
About Subnautica
Developed and published by Unknown Worlds Entertainment, Subnautica is an open-world underwater survival game that was fully released on January 23, 2018, for PC, following four years in Steam Early Access. Players take on the role of a survivor who crash-lands on an ocean-covered alien planet and must gather resources, craft equipment, and build underwater bases to stay alive while uncovering the planet's secrets.
The game is built around vertical exploration. The ocean begins as a shallow, brightly lit reef teeming with wildlife and resources, and gradually gives way to deeper, darker, and more dangerous biomes the further down players descend. Each zone has its own ecosystem of creatures, materials, and environmental hazards, with the abyssal depths presenting a fundamentally different experience from the shallow zones near the surface. Navigation is handled through a range of craftable vehicles, from the basic Seamoth personal submarine to the large Cyclops, a fully crewed submarine capable of housing a base module inside it.
Subnautica has no traditional combat system. Survival depends on oxygen management, hunger and thirst, depth pressure, and avoiding or outwitting the planet's more aggressive fauna rather than fighting it. Resources are gathered by scanning, collecting, and fabricating using an in-game blueprint system that unlocks progressively as players explore. The story is told entirely through environmental discovery, radio signals, and data logs found throughout the ocean.
Subnautica holds a Metacritic score of 87 and an Overwhelmingly Positive overall Steam rating across over 330,000 reviews, making it one of the highest-rated survival games ever released on PC. Subnautica is not currently available on Xbox Game Pass. Purchasing a key is the most straightforward way to access the game, with no subscription required and permanent ownership.
Region & Activation
This game key is available in multiple regions. Select your region at checkout to see availability and pricing for your country. If you are unsure whether your country is supported, check the activation details on the product page before purchasing.
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System Requirements
Minimum
- Requires a 64-bit processor and operating system
- OS
- Windows Vista SP2 or newer, 64-bit
- Processor
- Intel Haswell 2 cores / 4 threads @ 2.5Ghz or equivalent
- Memory
- 4 GB RAM
- Graphics
- Intel HD 4600 or equivalent - This includes most GPUs scoring greater than 950 points in the 3DMark Fire Strike benchmark
- DirectX
- Version 11
- Storage
- 20 GB available space
- VR Support
- SteamVR. Keyboard or gamepad required
Recommended
- Requires a 64-bit processor and operating system
- OS
- Windows Vista SP2 or newer, 64-bit
- Processor
- Intel Haswell 4 cores / 4 threads @ 3.2Ghz or equivalent
- Memory
- 8 GB RAM
- Graphics
- Nvidia GTX 550 Ti or equivalent, 2GB VRAM
- DirectX
- Version 11
- Storage
- 20 GB available space
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Buyer reviews
5 · 2 verified reviews
juraquille.mihawk420
23 Sep 2026
Joao C.
22 Sep 2026
Fast Checkout
PC · Steam
Qty:
$5.50
Price is not final$33.77-84%
3% cashback on this purchaseInstant Delivery
24/7 Support
Subnautica FAQs
- Open the Steam client.
- Click "Add a Game" in the bottom left corner.
- Select "Activate a Product on Steam" from the dropdown.
- Enter the code and follow any on-screen instructions.
Your Subnautica key is delivered instantly after purchase. It will appear in your GameBoost account dashboard immediately after your payment is processed, with no waiting period.
Yes. GameBoost is a verified marketplace rated Excellent on Trustpilot with over 18,000 reviews. Every purchase includes instant delivery, 3% cashback in GB Coins, and 24/7 live chat support.
You are eligible for a refund if the key has not been revealed and a valid refund reason is provided and approved by GameBoost, if the delivered key is not as described (wrong edition, wrong platform, or cannot be activated in your country despite being listed as compatible), or if the key is invalid or duplicated. You are not eligible for a refund if the key has been revealed and redeemed successfully, if the key works correctly and matches the product description, or if you do not like the game or changed your mind. Contact GameBoost's 24/7 live chat support for any refund requests.
This is a Steam key, not an account. You activate it on your own existing Steam account and retain full ownership of the game permanently.
This key is available in multiple regions. Select your region at checkout to confirm availability for your country. If you are unsure whether your country is supported, check the activation details on the product page before completing your purchase.
No. Subnautica is not currently available on Xbox Game Pass. Purchasing a key is the most straightforward way to access the game, with permanent ownership and no subscription required.
No. Subnautica is a single-player-only game with no official multiplayer or co-op modes.
A standard playthrough of Subnautica takes around 25 to 35 hours. Players who explore every biome and pursue full base-building can expect significantly more playtime.
Yes. With a Metacritic score of 87 and an Overwhelmingly Positive Steam rating across over 330,000 reviews, Subnautica is one of the most acclaimed survival games ever made and a strong choice for players who enjoy exploration-driven gameplay.