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 Report abuse Latest News: 2014 Kickoff Update

22 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 1,429)
pokeylope Feb 14 2007, 11:06am says:

Wow. This reminds me of Black Mesa: Source... A lot. Just Blueshift. You guys should do Opposing Force too.

+1 vote     reply to comment
sutra_668 Feb 13 2007, 6:13pm says:

please make it in englisch your homepage!!!!!!!!!!!!!!!!!

+1 vote     reply to comment
ZitaX Feb 12 2007, 12:11pm says:

Homepage is down...

Whats going on?? O_O

+1 vote     reply to comment
Ultemate Feb 27 2007, 8:26pm says:

"That's why people would want the game as it was--just on the source engine."
Just like half-life:source ? If so - this is not "your" mod..

+1 vote     reply to comment
Ultemate Mar 12 2007, 1:43pm says:

Well, I suppose it will be depend on community activity... If there will be enough of people with perfect spoken english - characters will speak english ))
Later there will be vacancies so you can help us. :)

+1 vote     reply to comment
joker3004 Jan 25 2007, 10:30am says:


+1 vote     reply to comment
joker3004 Jan 25 2007, 10:29am says:


+1 vote     reply to comment
Kub Jan 24 2007, 7:22am says:

Argh... If we keep silence this doesn't mean we are dead. The team are humans too - they need to study. And even to rest, ok? So, don't panic.

+1 vote     reply to comment
MR.sugar Creator
MR.sugar Jan 23 2007, 10:11am says:


+1 vote   reply to comment
MR.sugar Creator
MR.sugar Jan 14 2007, 3:04am says:

Why is home page down again? Some problems?

+1 vote   reply to comment
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