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Send Log File to Developers
By 412.5ppm and 2 collaborators
How to send a detailed log file to Subnautica's development team.
Before considering sending the log file please make sure you have followed each step in the troubleshooting guide. It covers a lot of common issues. There is a high chance that it will cover your issue as well.
When you encounter a bug or problem in Subnautica, it is sometimes very useful to analyze the log file. Log files are text files generated by Subnautica every time you run the game. They record various things. They don't always tell what is going on, but sometimes do provide useful clues.

Usually, the best way to tell us about problems is to use the F8 feedback system. We would like to include a tool with Subnautica that will allow you to easily send a log file to us at the click of a button, but that's a little way off, so here's a method to do it manually.

Find the Log File on Windows
Open Windows Explorer, navigate to
C:\Users\<yourName>\AppData\LocalLow\Unknown Worlds\Subnautica

The file you want is called Player.log. Copy and paste it to somewhere convenient to you, so you can submit or email it to us.

In the case of really horrible crashes, the log file may be placed in an alternate location. You may find it in a datestamped folder, inside the top level Subnautica game directory:

Find the log file on Mac OSX
Go to Spotlight and type in console

Scroll Down on the left side and expand ~/Library/Logs then the Unknownworlds/Subnautica section, clicking on Player.log
~/Library/Logs/Unknown Worlds/Subnautica/Player.log

Go to up the top of the screen and click File then Save Copy As

Give it a name and choose where to save it that's easy for you to find, then click Save

You can then find the file where you placed it, and email it to us or even better post it on the forums for others to help. :)
Ask the community
Chances are you'll get a better, faster, more helpful reply if you put the log file in some public place instead of sending it to the developers. The reason is really simple: there are over a thousand times more people on the Steam forums, the Subnautica forums[], and the Discord chat[] than there are people on the development team. Do yourself a favor and ask the community for help. We, the developers, keep an eye on all these places. So if there is something of interest in the log file we'll know.
Send Log File
Sending a log file is a pretty technologically advanced process. Grab the log file and attach it to an email. Use a subject line that starts with Subnautica Log to make it easier for us to tell which emails contain logs. If you are playing in experimental branch, please start your subject line with Experimental Subnautica Log.

In the body of the email, please provide a brief explanation of the problem you encountered. For example, "Subnautica crashes when I pick up a peeper fish." Then, send the email to:

subnautica-support (at) unknownworlds (dot) com

You will receive an auto-reply pointing you to the troubleshooting guide and various other helpful community support places. That's all. Do not expect a human to reply!

That said, we do hear you. We aggregate and analyze the log files received. We are looking at the grand scheme of things. Chances are your log file shows a problem falling into one of these categories:
  • Issues specific to your machine, in which case the troubleshooting guide is what you really want. Feel free to ask community members for help to walk you through.
  • Issues specific to the Unity3D game engine we are using, in which case we aggregate them and send bug reports to Unity. Whether the issue actually gets fixed is at the mercy of Unity.
  • Issues specific to Subnautica which lead to crashing. The log files help us identify and fix corner cases, which helps us build a better game. We see them and take action where possible.
  • Non-crashing issues. No need to report those. We already know about them. All the script errors are automatically tracked and aggregated by Unity Analytics. All other gameplay issues are being tracked and aggregated by our F8 feedback tool[].
So again, do not expect a human to reply, but rest assured that the log files are useful to us.

That's it. Thanks for helping us make Subnautica better!

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Tiiiight Apr 30 @ 4:16pm 
HELP! My save file has disappeared after an update today on 4/30/21! I played earlier in the day and when i went to play again the save was gone! I did all the trouble shooting to find the save in epic and steam and its totally gone. The game says i have 21hrs of playtime but no file!
Harley Quinn Feb 20, 2020 @ 4:02am 
Help me. The seatrack module mk1 and mk2 is not transferred to inventory
★UP | julius ★TeamPyro★ Dec 19, 2018 @ 6:58am 
F8 is a feedbacktool. So when you see something beeing completely glitched you can use F8 to sent a screenshot and some text about whats wrong, they can than try to fix it. If
S34nG4m3Z Dec 17, 2018 @ 12:07pm 
F8 doesn't send it though
miklkit Aug 27, 2018 @ 11:17am 
I sent a log file in an email to you last night but it was rejected. "Access denied". How can I send the log to you? Your supplied email address does not work.

The Phantom Raspberry Blower Jul 20, 2018 @ 6:00am 
No-one cares about us AMD owners that cannot play the game, its a flipping joke
detective demoman May 31, 2018 @ 9:38pm 
Subanutica does not launch. I have logged over 100 hours of play doing verious things and now it does not lauch at all. I have tried all troubleshooting steps and have sent the team a crash report. I hope this issue is resolved soon. This was one of my favorite games.
The Flar Apr 14, 2018 @ 8:11pm 
Subnautica for me it started of fine but after playing it for a long time. It started crashing and the crashing got so bad that when i join my game it crashes right away.:steamsad:
★UP | julius ★TeamPyro★ Feb 14, 2018 @ 8:24am 
its sometimes takes time for them to respond, and there are a lot of people with problems, they cant always help them all, even though they try to
Private DB Feb 14, 2018 @ 2:01am 
How to receive help. Base completely disappeared with all the internal items floating in place minus the bioreactors and desalination machine. Sent email with save file but read that they don't respond.