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!

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Living quarters outbound Hazard Course Concepts
Blog RSS Feed Post news Report abuse Latest News: 2014 Kickoff Update

27 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

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Elevator to hell

Elevator to hell

Jun 15, 2011 Music 4 comments

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  (1200 - 1210 of 1,462)
Rhizobium Jan 30 2008 says:

You shouldn't have put GMan in there. He wasn't involved with Barney, and the fake voice just sounds silly. Other than that it's a great mod so far.

0 votes     reply to comment
Kub Jan 31 2008 replied:

Actually, yeah, it's just a teaser idea.

+1 vote     reply to comment
MR.sugar Creator
MR.sugar Jan 31 2008 replied:

I hope we will get trailer soon :)

+1 vote   reply to comment
MR.sugar Creator
MR.sugar Jan 31 2008 replied:

Yeah it doesnt fit to the story, thats true. Maybe its just for that video...

+1 vote   reply to comment
dogobot Jan 29 2008 says:

there is a total mod conversion of opp force blueshift and half life now lol....too bad non of them are released
operation black mesa=oppossing forces
black mesa=half life
barney's tales=blueshift
lol....cait wait for there releases

0 votes     reply to comment
eightDash Mar 13 2008 replied:

Uplink: Source=Half Life: Uplink

+1 vote     reply to comment
sutra_668 Jan 29 2008 says:

i yust can't enter the websate;(

0 votes     reply to comment
Alfrodos Jan 29 2008 says:

Music is Perfect!!!!

0 votes     reply to comment
shrieker Jan 29 2008 says:

Nice new website

+2 votes     reply to comment
rekondoergo Jan 29 2008 says:

keep up the fantastic work :D

+1 vote     reply to comment
dethtoll Jan 29 2008 says:

Congratulations! But I must re-emphasise the need for "classic" HECU soldiers- for consistency with Black Mesa Source and Operation Black Mesa. Maybe you could make it an option to use BMS/OBM's models. I understand you're going for realism, but since when has Half-Life ever been realistic?

+2 votes     reply to comment
MR.sugar Creator
MR.sugar Jan 29 2008 replied:

BMS tema soesnt want to do this...

+1 vote   reply to comment
dethtoll Jan 29 2008 replied:

That's kind of besides the point. I'm saying, you should allow the option for HECU soldiers rather than "real" Marines so it's true to the original game.

0 votes     reply to comment
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