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  (1330 - 1340 of 1,462)
mathew1927 May 27 2007 says:

I wonder if any of the people attempting to remake the old half life games like black mesa have thought about becoming one team so they can all get the job done faster

+1 vote     reply to comment
dethtoll May 13 2007 says:


you slaughtered that word.

+1 vote     reply to comment
ToniX May 22 2007 says:

I guess they are still working hard... some feedback would be nice anyway.

+1 vote     reply to comment
Amez Sep 5 2007 says:

You guys gotta sell this...

+1 vote     reply to comment
Kub May 27 2007 says:

mathew1927 , keep wondering.

+1 vote     reply to comment
Miroku08 Jul 9 2007 says:

Is the lair still in the game? Please let the lair still be there :(

+1 vote     reply to comment
sutra_668 Apr 30 2007 says:

it's so long last media i wonder how much they have done to this point come on it can't stay stil on 60% can enybary sey whats going on wit this mod i don't understent the language of the forum:(

+1 vote     reply to comment
AkFuttySeben Apr 16 2007 says:

Just fantastic, I love the player models although I suggest you replace the BF2 Hummer and DoD:S sandbags with your own ;)

+1 vote     reply to comment
Kub Apr 11 2007 says:

claytonian, exactly. But we are not planning to release any bonus or episodic content. This will be big complete mod with some delicious features. Stay tuned.
h.e.v.zombie, why don't you learn some Albanian, right?

+1 vote     reply to comment
h.e.v.zombie Apr 10 2007 says:

I really think this mod is dead cause the update are toooooooooo sloooooooow!
and lol@ the language on the homepage!
At least there must be someone say something about it, right?

+1 vote     reply to comment
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Guard Duty
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