TDI technical courses delivered by ESS-TEK
TDI Technical Diver training Without Compromise
TDI courses delivered by ESS-TEK —
the dedicated technical training division of Essex Scuba.
Structured, progression-based education for divers ready to move
beyond recreational limits and dive with purpose, control, and precision.
What Is ESS-TEK?
ESS-TEK exists for divers who want more than recreational limits. We deliver disciplined,
real-world TDI technical diving training built on precision, preparation, and control.
ESS-TEK is where technical divers are built — not rushed.
We specialise exclusively in TDI technical diving courses,
delivering disciplined training for divers progressing into decompression,
extended range, trimix, and closed-circuit rebreather diving.
Our approach is simple: strong foundations, realistic dive planning,
and mentorship that continues beyond certification.
- TDI-certified technical diving instructors with real-world experience
- Small class sizes for focused, individual development
- Training designed for demanding conditions
- Clear progression pathways — not fast-track certifications
- Ongoing mentorship beyond the course
Technical Diving Training with Purpose
Technical diving is not about chasing depth — it is about:
planning, control, and disciplined decision-making under pressure.
ESS-TEK TDI training focuses on decompression theory, advanced gas planning,
redundant equipment configuration, failure management, and team protocols —
the skills that define competent technical divers worldwide.
Why Train with TDI?
Technical Diving International (TDI) is one of the world’s
most respected technical diving agencies, trusted by divers operating
in challenging environments across the globe.
TDI’s modular system allows divers to progress methodically, build experience
at each stage, and develop skills that transfer across open-circuit and
closed-circuit technical diving.
Ready to Go Beyond Recreational Limits?
If you’re ready to begin technical diving training in the UK,
ESS-TEK provides the structure, experience, and mentorship to take you there.
TDI Technical Diving Courses (ESS‑TEK – Essex Scuba)
| Course Name | Depth Limit | Gas Mixes Used | Equipment Configuration | Core Skills & Focus Areas | Who It’s For |
|---|---|---|---|---|---|
| TDI Intro to Tech | No formal depth increase beyond recreational limits | Air & Nitrox | Twinset, Sidemount, Stage exposure | Buoyancy & trim mastery, propulsion techniques, team protocols, equipment configuration, foundational technical skills | Divers preparing for technical progression and decompression training |
| TDI Advanced Nitrox | Up to 40 m | Up to 100% O₂ | Twinset or sidemount + deco cylinders | Use of high‑oxygen mixes, accelerated decompression, gas analysis, oxygen exposure management | Divers seeking to extend bottom times and prepare for staged decompression |
| TDI Decompression Procedures | Up to 45 m | Nitrox, Oxygen | Twinset + deco stage(s) | Staged decompression, ascent planning, gas switch discipline, emergency decompression management | Divers ready to begin formal decompression diving |
| TDI Trimix (Helitrox / Entry‑Level) | Typically 45–55 m | Helitrox (O₂ + N₂ + He) | Twinset + stages | Reduced narcosis, gas density awareness, helium‑based gas planning | Divers progressing beyond nitrogen‑based decompression |
| TDI Advanced Trimix | Up to 100 m (hypoxic trimix) | Full Trimix (He‑based deep mixes) | Twinset + multiple deco stages | Hypoxic gas management, deep bailout planning, advanced emergency skills | Experienced technical divers progressing to extreme depth |
| TDI CCR Air Diluent Diver | 30 m, no‑decompression | Air diluent | Inspiration CCR | Loop management, buoyancy, oxygen monitoring, checklists, emergency drills | Divers beginning their closed‑circuit pathway [bing.com] |
| TDI CCR Helitrox Diver | Extended depth beyond air‑diluent limits | Helitrox diluent (He‑based) | Inspiration CCR | Reduced narcosis, gas density optimisation, multi‑gas CCR decompression, performance‑focused helium use | Certified CCR divers wanting clarity, efficiency & controlled decompression diving [bing.com] |
faq
Frequently Asked Questions
1. What is ESS‑TEK and how is it related to Essex Scuba?
ESS‑TEK is the dedicated technical diving division of Essex Scuba, specialising exclusively in TDI (Technical Diving International) training. ESS‑TEK provides structured, progression‑based pathways covering decompression, trimix, extended‑range, and CCR rebreather training. It is designed for divers who want to move beyond recreational limits with disciplined, real‑world technical development.
3. Do I need previous technical diving experience to start?
No. The first step in the TDI pathway is Intro to Tech, which is suitable for experienced recreational divers looking to build trim, buoyancy, propulsion, and equipment configuration skills before progressing into decompression or mixed‑gas training..
5. How does ESS‑TEK training differ from standard recreational scuba courses?
Technical training involves deeper dives, staged decompression, complex gas management, and redundant equipment systems. ESS‑TEK focuses on:
- Precision buoyancy and control
- Advanced gas planning
- Failure management
- Team protocols
- Situational awareness under pressure
- High‑realism skills preparation for demanding environments
It is a mentorship‑based approach rather than a fast‑track certification model.
7. Where does ESS‑TEK conduct training dives?
Training is delivered across top UK technical diving sites, including deep inland facilities and open‑water environments suitable for staged decompression, mixed‑gas, and CCR operations. Sessions include both classroom and in‑water components.
9. How do I know which TDI course to start with?
If you’re new to technical diving, start with Intro to Tech.
If you already hold Nitrox certification and want to extend your range, choose Advanced Nitrox + Decompression Procedures (often taken together).
If you’re interested in deep or helium‑based diving, progress to Trimix or CCR.
2. What TDI courses does ESS‑TEK offer?
ESS‑TEK delivers the full TDI progression, including:
- Intro to Tech
- Advanced Nitrox
- Decompression Procedures
- Trimix & Helitrox
- Advanced Trimix
- TDI CCR Air Diluent Diver
- TDI CCR Helitrox Diver
These courses cover everything from foundational technical skills to deep helium‑based and rebreather‑based diving.
4. What equipment do I need for TDI training with ESS‑TEK?
Different courses require different configurations.
Depending on your pathway, you may use:
- Twinset backmount
- Sidemount
- Stage/deco cylinders
- Inspiration CCR rebreather
- Redundant gas systems
- Multiple gas mixes (Nitrox, Oxygen, Trimix)
Your instructor will guide you through full configuration setup based on your chosen path.
6. Can I train on a Closed Circuit Rebreather (CCR) with ESS‑TEK?
Yes. ESS‑TEK offers TDI‑certified CCR training using the Inspiration Rebreather platform. You can begin with TDI CCR Air Diluent Diver, followed by TDI CCR Helitrox for helium‑based diluent use and extended‑range capabilities.
8. Do your courses include real‑world technical dive planning?
Yes. All ESS‑TEK courses incorporate realistic scenario training such as:
- Multi‑gas switches
- Decompression schedule planning
- Helium logistics
- Failure drills and bailout strategy
- Team communications
- Emergency and contingency planning
This prepares divers for demanding environments like deep wrecks, cold‑water technical dives, and international expeditions.
10. How do I book a TDI course with ESS‑TEK?
You can request course dates, equipment requirements, or training assessments by contacting Essex Scuba directly via the Contact Us page. A technical instructor will guide you through course prerequisites and build a personalised training plan.