Descend into the depths of an alien underwater world filled with wonder and peril. Craft equipment, pilot submarines and out-smart wildlife to explore lush coral reefs, volcanoes, cave systems, and more - all while trying to survive. 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
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.

The player can select a Game Mode when starting a new save file. Each Game mode imposes different restrictions (or lack thereof) on gameplay.

• Survival Mode - To stay alive, the Player must manage their health, Oxygen, Food, and Water levels. If the player runs out of health or oxygen, they die and lose all of the items in their inventory. If the player runs out of either food or water, they will begin to lose health until they die.
• Freedom Mode - Similar to Survival Mode, but the player does not need to maintain their food or water levels. The Sustenance section of the Fabricator is not available.
• Hardcore Mode - Close to Survival Mode, but restricts the player to a single life only; if they die, the game ends, forcing them to start over from the beginning. In addition, the PDA does not warn the player when their Oxygen is low, and you cannot save the game anytime like in the other modes; the only option is to Save & Quit.
• Creative Mode - Creative is a sandbox mode for players who want to freely explore and build. The player cannot die and does not have to worry about health, oxygen, hunger, or thirst. Materials and Blueprints are not required for crafting, and Vehicles and Seabases do not require Energy to operate and cannot be damaged. The player can make story progress in this mode, despite the description saying otherwise.

Microbadges:

• Save game issue fix - you should now be able to return to those previously “unsavable” files and continue playing without losing further data.
• Fix for screen tearing on 4K displays.

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• Save game issue and misc bug fixes.
• Incremental garbage collection added to help smooth out framerate.
• Improved world streaming.
• Rocket platform physics issues addressed.
• Performance improvements.

• The Bladderfish scarcity in Safe Shallows is now resolved.
• Language selector to the main menu.
• theDeveloper menu option returns to consoles! Warning: some of these options can introduce instability to your game. To access this menu while in a game, press the OPTIONS button to bring up the menu, then press the right and left bumper buttons together at the same time.

• Save game issue fix - fail to display an existing saved-game, and freeze when attempting to save a new one.
• Japanese & Korean fonts now render properly.

• Some crashing fixed - caused by too much memory being used.
• Optimizations to address memory related crashes in end game.
• Photo albums now save properly.
• Removed a false wall in the Aurora locker room.
• Seamoth docking now more reliable.

• Improved world streaming.
• Some crashing fixed.
• Fixed an issue causing objects to fall through the ground.
• Fixed an issues causing missing geometry in alien bases.
• Changed actions to occur on button press, rather than on button release.
• Improved accuracy of propulsion cannon physics.

• The game will now pause.
• Stability fixes.
• Performance optimizations.
• Fixed Reefback erratic behavior and missing plants.
• Fixed an issue where screenshots could display at 1/4 size.
• Fixed an issue where the cyclops vehicle bay hatch could spawn.

• Some crashing fixed.