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Platforms: PC, Linux
Languages: English
Feb 15 @ 11:14am

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Recent Announcements View All (1)
Patch v0.5.4.3 released
  • a new enemy
  • some new sound effects by Omniary
  • some structure-specific damage sounds
  • the size of the docked subs/shuttles is taken into account when determining the spawn position of a sub (large multi-part subs shouldn't spawn inside walls anymore)
  • explosion damage is calculated based on the distance to the closest surface of a limb instead of the center position of the limb (i.e. large monsters can be damaged by smaller explosions)
  • added an Undertow Games splash screen
  • updated to a newer version of the NVorbis sound library
  • fixed a game-crashing null reference exception caused by wires
  • fixed an issue in the way items in alien ruins are initialized, which occasionally caused ID mismatches (and desync) in items and characters created after generating the ruins
  • fixed some item properties not being saved if changed in the editor (e.g. battery recharge speed)
  • fixed characters turning into husks when they die, even if the infection has been cured
  • fixed docking ports being disconnected in the mirrored subs in the combat missions
  • unconscious characters collide with stairs when they're being dragged up
  • fixed characters sinking/floating away when using railgun controllers underwater


Barotrauma is an online multiplayer game heavily inspired by Space Station 13. The game takes place in a submarine travelling through the icy depths of Jupiter’s moon Europa. The bone-crushing pressure outside the submarine, the strange creatures inhabiting the ocean and the potentially dangerous equipment and machines on board ensure that the tiniest slip can turn the game into a chaotic struggle for survival.

Join a crew of up to 16 players or play the single player campaign with a crew of AI controlled characters. There are several different character classes to choose from, each with different skill sets and responsibilities on board the vessel. Take command of the crew as the captain, take responsibility of keeping the submarine operational as an engineer or a mechanic, save lives as a medical officer or keep the submarine safe from external and internal threats as a security officer.

You'll also have to be on the lookout for saboteurs - some players may be given secret objectives at the start of each round.

The submarines in Barotrauma are complex beasts with hundreds or thousands of interconnected items, machines and devices. Most disasters and tricky situations you'll face are completely non-scripted, arising dynamically from the interaction between the submarine, the players and the environment: Something punched a hole in the ballast tanks and the ship is rapidly sinking towards crush depth. The nuclear reactor overheated and fried a dozen junction boxes across the ship. The guy wearing a clown suit stole and hid all the oxygen tanks...

The game also features a built-in submarine editor that allows you to design and build your own submarines.

The subsurface ocean of Europa is a dangerous place. The icy waters are inhabited by bizarre creatures ranging from harmless fish to enormous bloodthirsty horrors, and from biomechanical alien sentinels to human divers taken over by a strange parasitic lifeform. The ocean itself is also a major threat, as the pressure can crush an unprotected submarineer in seconds.

The environments of the game are procedurally generated. The crew must navigate their way through underwater chasms and caverns, and occasionally leave the safety of their vessel to salvage artifacts from labyrinthian alien ruins.

A free alpha version of the game is available for Windows and Linux from the following link. In-development versions will be free for download while we're working towards releasing the full game.

Official discussion forum[]
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Деня 1 hour ago 
Awesome game.
Amazing game it needs to be greenlight right now. Genuinely play this every day. Only complaint is how hard the "Moloch" creatures are to beat playing solo, i think its roughly 3-6 rail shells to kill coupled with having to pilot and reload at the same time is a little infuriating. Overall amazing world and gameplay 10/10 in my ten games of all time.
Chernobyl 7 hours ago 
looks decent
Plastered Pegasus 7 hours ago 
@NotVinyl Dude there's a free alpha on the website. You don't have to wait for Greenlight.
NotVinyl 8 hours ago 
I wanna play this with my friends right now ._.)/ I say GREEN LIGHT right now
Pink 9 hours ago 
Have an insane amount of fun every time my buddies and I play this game. Would love to see it get some more love, so much entertainment.
Regalis  [author] 10 hours ago 
@Meow :3
The game is being built on MonoGame []. It's a somewhat low-level framework (at least compared to something like Unity or Unreal Engine) that requires you to implement a lot of the basic stuff yourself, so I guess it wouldn't be entirely wrong to say that the game uses a custom engine made with MonoGame.
Meow :3 10 hours ago 
Regalis, What engine did you use for this game? Or was the engine completely created by you?
thank you that sounds great. I tried the alpha before so its great to know that the AI won't kill themselves on the stairs
Regalis  [author] 11 hours ago 
@Pigeon Master of the World
The AI will be good enough to assist you, but the AI crew won't be able to handle all tasks on the submarine and will do mistakes every now and then. A "too good" AI would most likely make the game boring - what would the player do if the AI is competent enough to maintain the submarine?

There's still a lot of room for improvement though. If you have tried the alpha, you may have noticed that currently the only thing the AI characters are good at is getting themselves killed.