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

19 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  (0 - 10 of 1,390)
Guest Sep 26 2014, 8:18am says:

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Guest Aug 30 2014, 10:30pm says:

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raunyfarias Aug 3 2014, 8:49pm says:

I hope see the "Hidden" content like "Chuntoads Liar" in the mod, they're epic!

+2 votes     reply to comment
MR.sugar Aug 10 2014, 5:37am replied:

Sure, you can count on that there will be some easter eggs scattered around :).

+1 vote     reply to comment
nickyforiasha Jul 27 2014, 1:04am says:

will this be for linux too? cuz operation black mesa is. I use linux to get 100% out of my GPU and i suggest all Half-ers to do the same with any source game, and i ask you guys to create support

+1 vote     reply to comment
MR.sugar Jul 30 2014, 5:46am replied:

Yes, we would like to support Linux and MAC with both, OBM and GD

+2 votes     reply to comment
Guest Jul 21 2014, 2:55am says:

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MR.sugar Jul 26 2014, 6:01am replied:

Maybe, there is one thing we plan to implement from the early builds of Blue shift, but it will also be optional.

+1 vote     reply to comment
werdman2 Jul 10 2014, 4:30pm buried:


why is has the bull squid being redesigned can you not directly use the assets from black mesa source? or is it because the image was released before black mesa was released?

-5 votes     reply to comment
CommanderBox Jul 12 2014, 12:41pm replied:

have you ever heard of the word called "stealing"?

+4 votes     reply to comment
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Latest tweets from @guardduty

An early WIP of Living quarters outbound by A_LegendaryEwok. This can give you idea how the content can change...

Mar 1 2013, 4:28pm

The update is closer and closer guys. That's why we merge everything together. Like the twitter right now:...

Feb 21 2013, 5:42am

The Greenlight campaign will kick-start soon-ish!

Feb 16 2013, 7:32pm

Guys, we have competition! Opposing force is being remaked for Minecraft ;)...

Feb 16 2013, 3:58am

The very first step towards our great goal !

Feb 14 2013, 12:15pm

As people still keep asking again, again and again... We are not going to use Black Mesa content, nor cooperate...

Feb 4 2013, 4:50am

Přidal jsem nové fotky na Facebook

Jan 25 2013, 12:17pm

Přidal jsem nové fotky na Facebook

Jan 20 2013, 7:22am

Just giving you heads up that we are not dead, we are just working behind the curtain ;).

Jan 18 2013, 7:06am

Happy new year everyone. Two members of TS meet today and with enough alcohol in blood, we consider leaking OBM...

Dec 31 2012, 8:04pm

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