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!

Image RSS Feed Latest Screens
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

Downloads RSS Feed Latest Downloads
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  (30 - 40 of 1,435)
flippedoutkyrii Jan 3 2015, 12:40am says:

VERY old Glock footage from the mod, back when it was still called "Blue Shift - Source" and then for a rather brief period "Barney's Tales".

Man, that brings me back to the glory days of HL2 modding...

+2 votes     reply to comment
MR.sugar Creator
MR.sugar Jan 7 2015, 4:28pm replied:

Ohhh memories :)

+2 votes   reply to comment
BloxxingBlocks Dec 17 2014, 12:43pm says:

I got idea: Just make this faster! I can't wait!!

-2 votes     reply to comment
Crypt Jan 12 2015, 2:35pm replied:

I got idea: Just give the team free housing, food and utilities!

+1 vote     reply to comment
GameFan1997 Jan 11 2015, 6:48pm replied:

No. No! These things take time to make, and require attention to EVERY little detail. Rushing through it would ruin the game.

+2 votes     reply to comment
Guest Nov 23 2014, 11:18am says:

This comment is currently awaiting admin approval, join now to view.

MR.sugar Creator
MR.sugar Nov 25 2014, 8:44am replied:

Guard Duty will be free.

+3 votes   reply to comment
BloxxingBlocks Dec 17 2014, 12:45pm replied:

Wow! I was worried if I had to pay to play it! I really like Half Life!

+1 vote     reply to comment
Guest Nov 10 2014, 3:09pm says:

This comment is currently awaiting admin approval, join now to view.

MR.sugar Creator
MR.sugar Nov 16 2014, 5:51am replied:

We will see about that. We haven't made this decision yet.

+1 vote   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 embed code provided (more).

Guard Duty
Guard Duty
Last Update
7 months ago
3,420 members