Black Water Tek

I was very lucky last week to teach a wonderful bunch of students ! Congratualtions to Bayne, Alex, John and Chet on well desrerved certifications and their dedication, discipline and team work. 4 new solid and competent TDI Advanced Nitrox and Decompression Procedures Divers. Well done lads and thanks for a very entertaining and pleasurable week working with you all.

Fantastic job and a wonderful achievemnent by Ollie J on passing hi TDI Advanced Nitrox and Deco Procedures to 45m with flying colours.
Its been a pleasure to have you around Blue Marlin Tech | Technical Diving | TDI Indonesia and qe all look forward to diving withbyou again soon.
Special thanks to Matvei for the instructor assist and all his hard work.

All-new, completely rebuilt .

— small, continuous improvements that add up to something much bigger.

When I first thought Gas Guru was finished, I quickly realised that after a couple of months of real-world use, there was always something that could be improved, refined or added.

That’s the whole point of Kaizen.

The app has evolved through hundreds of pieces of feedback from divers using it in the real world. Every suggestion, test, recommendation and criticism has helped shape it into what it is today.

A massive thank you to Brett for all your expertise and hard work, and to everyone who has supported Gas Guru by testing it, recommending it, purchasing it, advising me and simply using it.

I’m incredibly grateful, particularly to all the tech team ,tech instructors, compressor guys and divers Blue Marlin Tech | Technical Diving | TDI Indonesia 🙏

If you haven't tried Gas Guru yet, download it now from the Apple App Store or Google Play.



Analysis of a 15/41 trimix dikuentvin 18 degree water.

Massive congratulations to and on absolutely smashing their TDI JJ-CCR Air Diluent nd Helitrox certifications to 45m!
Outstanding focus, discipline, and performance throughout the course. Great teamwork, solid control, excellent awareness, and a real commitment to doing things properly.
This is where the real adventure begins.
Proud moment as an instructor watching divers build the mindset and skills needed for safe, confident CCR diving.
Welcome to the next level of exploration.

Huge congratulations to on passing her TDI Advanced Mixed Gas 100m course on the . An outstanding achievement.
Yana put in serious work, stayed focused, and applied every piece of feedback. She earned this.
It was also a pleasure working with Chas, who came in honest about where he was and committed fully to the MOD 3 and two weeks of training dives. He put in the work—refining technique, procedures, configuration, and mindset alongside Yana.
The result speaks for itself: two solid CCR divers, operating as a team.
This is why I teach.

Special thanks to ._.chris and for hosting and all the support.

See you all next year !!

What started as an idea two years ago — and took a year to actually build — finally became a reality. The first in my Dive To Survive series: DTS Gas Guru is officially live on the App Store and Google Play.
It started in the classroom. My students were working out the maximum safe operating depth of a gas mix, but with multiple limits to consider simultaneously — oxygen partial pressure, gas density, and narcotic value — it gets complicated fast. The tools available couldn't bring it all together cleanly, so I built one that could.
This app has been a labour of love, designed specifically for technical divers, CCR rebreather divers, gas blenders, students and instructors who need accurate, reliable gas calculations in the water and on the dive deck.
We're now on v1.5 and it wouldn't have got here without an incredible group of people who gave their time, their expertise, and their honest feedback along the way — technical divers, rebreather divers, instructors and blenders from all over the world, across every agency and nationality. The technical diving community can have a reputation for being cliquey, but this journey has genuinely renewed my faith in the industry. And some I've never met, from all walks of life, all corners of the world, all came together to help make this better. I couldn't be more grateful. You know who you are. Thank you. Without you, this wouldn't exist.
To everyone who tested, broke it, suggested improvements, and kept pushing me — this is for you. 🙏
📱 App Store: https://apps.apple.com/app/gas-guru/id6761082629
📱 Google Play: https://play.google.com/store/apps/details?id=com.blackwatertek.dtsgasguru
Plan it. Trust it. Dive it. 🤿

🎉 Huge congratulations to Cassius, Tom, Sherwin, Eliza and Matvey on completing your TDI Instructor Crossover and Nitrox Instructor Course! 🙌🏼
This wasn't your standard 2-day course — we spent 3 full days together building the most solid foundation possible, because these guys aren't just stopping at Nitrox. They're on the path to becoming fully fledged technical diving instructors, and that deserves the right start.
5 nationalities. One incredible team. Excellent mindset across the board, they worked hard, they gelled, and they all passed with flying colours. 🌍
We also made The Human Diver Human Factors in Diving online course compulsory — and it's staying that way for all instructor courses going forward. If you're serious about technical instruction, understanding human factors isn't optional.
At Black Water Tek, we're committed to laying the best possible foundation for the next generation of technical diving instructors. These guys are proof of what that looks like. 💪
Tag your teammates below and share this — you earned it! 🤿