You are Barney Calhoun, a security guard at the Black Mesa Research Facility. Unknowingly to you, the next few hours of your shift will change your life forever...
Re-live the exciting adventure of Blue Shift on the award winning Source Engine and prepare for the shift of your life!
Welcome to Guard Duty.


- As a total conversion mod, Guard Duty aims to be composed of entirely custom content
- All original maps re-created and re-envisioned for better realism and gameplay.
- Some maps are enlarge/extended to create a more lengthy and immersive game.
- Improved AI, making enemies smarter and even more dangerous than ever before.
- More enemy encounters to keep the action fresh.
- Scripted scenes with all the original Blue Shift characters to help bring the story to life.
- Textures and models that will push the limit of the Source Engine, to bring you as much artistic detail as possible.
- All new voices, sounds and music.
- Multiplayer, which may (or may not) contain various game modes.

And much more!

                                                                                                     COMING SOON
Image RSS Feed Latest Screens
Living quarters outbound Hazard Course Concepts
Blog RSS Feed Report abuse Latest News: 2014 Kickoff Update

18 comments by Uphys on Mar 29th, 2014

Welcome to our first media update this year!

Read Full Article.

Multiplayer Beta Release Q1 2014 Cancelled

Our plan to bring you the multiplayer beta of Operation Black Mesa early this year didn't work out, regrettably. Several factors and circumstances forced us to completely keep it under the hood until further notice.

Multiplayer Progress

Multiplayer will feature classic maps such as Yard, Crossfire and Boot Camp as well as brand-new ones like Deptcharge and Gambit from day 1.
Currently in development: CTF mode and weapon placement.


Singleplayer Campaign

Development is running smoothly; those NPCs aren't going to animate themselves though! If you're interested in joining our team, check out the jobs page where you can find all positions currently open. We look forward to welcoming you on board!

Pit Worm's Nest

Remember Guard Duty (Blue Shift: Source)? We're making solid progress here too:

Living Quarters Outbound

OBM: The Video Game?

We've been given the option of developing our projects as full indie titles to be sold on Steam!
This opens up a whole lot of attractive possibilities to consider; however no decision has been reached yet as to this matter.

Alien Controller

M1A1 Tank

Thanks for your support in making all of this possible!

Until next time,
Tripmine Dev Team

Media RSS Feed Latest Audio
Downloads RSS Feed Latest Downloads
Elevator to hell

Elevator to hell

Jun 15, 2011 Music 1 comment

An example from our soundtrack. This track is made by "Becket007".



Jun 15, 2011 Music 2 comments

An example of Xen track. This track is created by 8BitLord.

Sigh of relief

Sigh of relief

Oct 16, 2009 Music 6 comments

An example from our soundtrack. This track is made by "Mordekai"

Post comment Comments  (30 - 40 of 1,388)
JohnSmirnov Jan 17 2014, 8:45am says:

Are you going to post it on Steam Greenlight?

+1 vote     reply to comment
MR.sugar Jan 17 2014, 6:25pm replied:

No plans to do it so far, mainly because Greenlight will shut down soon.

+2 votes     reply to comment
Ragnar_Lothbrok Jan 17 2014, 6:56pm replied:

F*cking Valve, this will bring worse consequences for OBM? :(

+1 vote     reply to comment
JohnSmirnov Jan 17 2014, 7:55pm replied:

Gabe didnt said that, El Oshcuro is the one who said it on Twitter (reblogged from SteamDevSats). But they said they will make the easier and better way to games appear on Steam if/when they will get rid of Greenlight.

+1 vote     reply to comment
JohnSmirnov Jan 17 2014, 8:05pm replied: +1 vote     reply to comment
MR.sugar Jan 18 2014, 3:51am replied:

Yea, though it's still unclear what exactly will happen. Our team, in terms of PR, is focusing on OBM more right now and Guard Duty is being developed behind the curtain. And so far, it looks like we are never going to post it to Greenlight (or any kind of future Steam-approval process).

+2 votes     reply to comment
JohnSmirnov Jan 18 2014, 9:19pm replied:

Why? You mean you may never finish it?

+1 vote     reply to comment
Ragnar_Lothbrok Jan 13 2014, 4:21pm says:

I'm very impatient to play this mod :) when there will be GD media update?

+2 votes     reply to comment
Crypt Jan 9 2014, 10:24pm replied:

Anyone even slightly computer savvy will know that you should keep safe backups of any file that you like more than a little bit.

+1 vote     reply to comment
MR.sugar Dec 18 2013, 6:41pm replied:

If you read this interview, you will find the answer.

Our data are completely safe :)

+4 votes     reply to comment
Post a Comment
click to sign in

You are not logged in, your comment will be anonymous unless you join the community today (totally free - or sign in with your social account on the right) which we encourage all contributors to do.

2000 characters limit; HTML formatting and smileys are not supported - text only

Half-Life 2 Icon
Tripmine Studios
Send Message
Official Page
Release Date
Mod Watch
Track this mod
First Person Shooter
Single Player

Latest tweets from

It can take up to a few hours for tweets to begin appearing.

Embed Buttons

Promote Guard Duty on your homepage or blog by selecting a button and using the HTML code provided (more).

Guard Duty
Guard Duty
303 of 22,181
Last Update
2 weeks ago
3,329 members