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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Those who carefully watch our space probably noticed that besides our Guard Duty summer update, we have also released several dev.blogs of which the last of which was released today. And what it was all about?

A Byte of Insight - Programming Dev Blog

This dev.blogs uncovers something we haven´t been talking about much in our updates. Tmast, one of our programmers wrote down his first about what he has been cooking for you to enhence your experience by adding some nice features to the Source engine. Get yourself familiar with just a fragments of some visual improvements for Operation Black Mesa and Guard Duty.

What's a Brush? - Chris's Prop Devblog (part 2)

Our artists never sleep and Chris is working round the clock to produce some top-tier models and textures. As usual, he pushes the Source Engine beyond its limits, creating crucial assets for level designers to create the stunning and realistic environments you will experience.

EGGs Prop Party

Our senior developer, Brandon, seems to be damn party boy. This endless party is something you don´t want to miss out. Throughout this summer, he has released several updates showcasing more of his artistic talent. And this party is not over yet.

Stranger Beings - AI Dev Blog

Quite sometime ago, we released a video showcasing our AI. Many of you was very curious what´s the current state of our AI system. Chris (Tmast) was working hard on improving and fixing our AI and he wants to show you that we take this bussiness seriously. For us, AI is very important for delivering you breathtaking and realistic experience. Our AI is not about simple routines, it´s about creating believeable and lifelike characters, each with it´s own unique characteristics.

Thank you for your support throught the years and we hope you stick with us for the future. This is our last contribution for this summer seasson, but never fear! We are still pushing forward towards our glorious goal and you can bet you will hear from us in the future. In the mean time, this is where we get off.

Guard Duty summer media update

Guard Duty summer media update

News 38 comments

We work hard even during hot summer days and we would like to share some of our work with you. Enjoy this new Guard Duty update.

Operation Black Mesa Update

Operation Black Mesa Update

News 19 comments

We are excited to share some more information and media. A brief look at what 2016 was like and what future might bring. Find out more in the update and...

Life Signs 2015

Life Signs 2015

News 34 comments

Operation Black Mesa and Guard Duty are back! It's been a very busy year and here's what we've been up to.

2014 Kickoff Update

2014 Kickoff Update

News 30 comments

The latest news on Operation Black Mesa and Guard Duty!

RSS Files
Elevator to hell

Elevator to hell

Music 4 comments

An example from our soundtrack. This track is made by "Becket007".



Music 3 comments

An example of Xen track. This track is created by 8BitLord.

Sigh of relief

Sigh of relief

Music 6 comments

An example from our soundtrack. This track is made by "Mordekai"

Comments  (0 - 10 of 1,479)

Please do this remake :D
It will be great and i cant wait :)

Reply Good karma Bad karma+4 votes

i have high hopes for this mod!

Reply Good karma Bad karma+1 vote

Well I am glad you guys are showing progress & it's looking good keep up the great work. :)

Reply Good karma Bad karma+1 vote

I like this news!
Black mesa
Operation black mesa
Black mesa guard duty
Become source!

Reply Good karma Bad karma+1 vote

but wait isint the entire mod free or will it be paid

Reply Good karma Bad karma+2 votes
MR.sugar Creator

Go ahead and find your answer here ;)

Reply Good karma+3 votes

However, it much better to be paid since you guys also did a lot of job ever since 2007 by sacrificing spare time to put up something like this. Especially, you guys also needed to feed family as well in real life. All thanks to the crazy foreign policy you over there that ruined everything. Which you guys had lose the job.


Reply Good karma Bad karma+4 votes

Hope it's alive.

Reply Good karma Bad karma-3 votes
EvilGoodGuy Creator

Hope is irrelevant. We have been alive this whole time :)

Reply Good karma+6 votes

return (are_we_alive===true?"yes":"dead");

Reply Good karma Bad karma-1 votes
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Latest tweets from @tripminestudios, @guardduty

Summer is over and here is a short summary of our dev.blogs:

Sep 1 2017 by tripminestudios

Guard Duty has got some love "PR finally" and got it´s own Media Release :)

Aug 10 2017 by tripminestudios

Stuff is still going on at Tripmine and here is small insight, thanks to Chris for his blog continuation:

Jul 29 2017 by tripminestudios

A little catch up on what is going on in the programming department :)

Jun 2 2017 by tripminestudios

Time for new dev. blog folks :)

Apr 4 2017 by tripminestudios

throwing a bone here. Keep checking back, as we throw bone from time to time ;)

Jan 22 2017 by tripminestudios

How do you feel about it? It looks like Valve might make some exciting announcements this year :)

Jan 18 2017 by tripminestudios

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

Mar 1 2013 by guardduty

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

Feb 21 2013 by guardduty

The Greenlight campaign will kick-start soon-ish!

Feb 16 2013 by guardduty

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