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Big Blue Tech - Koh Tao - Thailand                                                             Facebook  Twitter  GooglePlus

Intro to Tech

Intro-to-TechThe TDI Intro to Tech course is the first step towards becoming a technical diver. It's the foundation course that introduces you to the equipment and techniques that technical divers use (having two tanks on your back!), and provides a framework to build from as you progress through subsequent technical diving courses.

However, even if you don't think you want to become a fully qualified technical diver, it's still a really worthwhile course to do, as it will help improve your buoyancy and positioning (trim) when diving on a single tank. Moreover, if you're undertaking your divemaster training, completing the intro to tech course during or after your training will really add to your skillset as a professional diver.

For many people, diving with two tanks (a twinset) on their back makes them suddenly feel like an open water student all over again! But it really doesn't take much time underwater before you start to get the hang of it, and you can then focus on improving your buoyancy and positioning, and getting familiar with the layout of the equipment you are wearing. After that, you can work on the skills you'll need to know to take your training further.

The fundamentals of this course are:

  • Learning how to control and improve your buoyancy.
  • Achieving and maintaining good body positioning
  • Improving your awareness, before, during, and after a dive.
  • Gaining an understanding of how the equipment works, and how to utilise it during your dive.
  • Managing the gas you are carrying to get the most out of your dive.
  • Learning a variety of skills essential to becoming a technical diver.
  • Effective deployment of a DSMB.
  • Ascent procedures.

Course outline:

  • Duration- 2- 2 and a half days
  • Number of dives- 3 open water dives + 1 optional post qualification dive
  • Max depth during the course- 23m
  • Max depth for diving in a twinset after the course- your current certification limit.

Course Fees:

  • 10,000 Thai Baht
  • (All course fees and materials included with no hidden extras).


  • 15 years of age or older
  • Advanced open water diver
  • 25 logged dives

Advanced Nitrox

Advanced-nitroxThe advanced nitrox course takes you beyond the foundations of intro to tech or sidemount, and technical diving procedures to prepare you for decompression diving. It introduces the use of enriched air nitrox (EANx) mixtures from 40% to 99%, and pure oxygen (100% O2), for optimal mixtures to depths not exceeding 40m/130ft.

The course trains you in the benefits, hazards a
nd proper procedures for utilising air, EANx 22%-99%, and oxygen for dives not requiring staged decompression. It builds on concepts and practices introduced in the Basic Nitrox course, as well as detailed coverage of Central Nervous System (CNS) and whole of body oxygen toxicity tracking, common mixing methods, computing best mixes for planned depths, benefits and limitations of hyperoxic gase mixtures, dive planning procedures, calculating gas requirements, and additional equipment considerations. At the completion of the course, successful candidates will be certified to use nitrox mixes from 22% - 99%, and pure oxgyen (100% O2) as a breathing gas.

Course Details:

  • 3 days
  • 4 open water dives minimum
  • Max depth 40m / 180ft

Advanced Nitrox 15,000 Thai baht or combine with Deompression for only 30,000 Thai Baht.


  • 18 years of age or older
  • Advanced Open Water Diver
  • Basic Nitrox or equivalent
  • Intro to Tech or equivalent


sidemount-chumphon-pinnacleSidemount diving has been around for decades in the cave diving world, but was always seen as a very specialised and exclusive way of diving. This has all changed in the last few years as equipment manufacturers started to introduce much more practical methods for attaching diving cylinders to the diver. The result is that sidemount diving has really taken off, and is becoming more and more popular, for both technical diving applications and also shallow recreational fun diving.

When you first dive in sidemount you quickly realise why. It's a really comfortable way to dive. Where the BC is situated makes you want to be flat, and as the cylinders are tucked out of the way to your sides, you have a real feeling of freedom. Sidemount is an incredibly versatile way of diving and can be done using one cylinder or two. Cylinders can be easily attached when already in the water, so it's ideal for people with back problems, and perfectly suited to shore diving or boat diving. Having a redundant gas source makes your diving a little safer too as you are less reliant on your buddy in the event of an equipment failure. This redundancy makes it the perfect platform for decompression diving, not to mention the feeling of comfort on long decompression stops. Moreover, as it is easy to unclip the tanks and bring them forward, you can have a lot of fun getting through tighter spaces when penetrating wrecks, caves or swim-throughs.

TDI’s technical sidemount course is a must for anyone wanting to either do more with their rereational fun diving, or advance on to become a fuly qualified technical diver. You will learn diving techniques that are directly applicable to any type of diving, such as:

  • Equipment considerations
  • Dive planning
  • Gas management
  • DSMB deployment methods
  • Propulsion techniques
  • Trim and Buoyancy
  • Different water entries/exits

The Sidemount Diver course is strictly non-decompression with a maximum depth limit of 40m/130ft (or within the limit of the student’s current certification, whichever is shallower). Prerequisites to enroll on the TDI technical sidemount Diver course are: Age 18 (or 15 with parental consent), SDI Open Water Diver or equivalent.

Course Fees 12,000 Thai Baht - click here to book. This course can also be combined with TDI Intro to Tech at a cost of 18,000 Thai Baht and lear to dive both sidemount and Twinset.

We also offer Recreational sidemount with SDI,SSI and PADI for more details contact This email address is being protected from spambots. You need JavaScript enabled to view it. 

Decompression Procedures

Most recreational divers are limited to dive no deeper than 40m, and under no circumstances are alllowed to go into decompression. There are numerous reasons why these are sensible limitations, lack of gas, dependency on a buddy, inefficiency of air as a decompression gas to name but a few. 

Advanced nitrox diving introduces you to technical diving procedures and equipment considerations necessary for decompression diving. The decompression procedures course takes these concepts further and covers the following practical and theoretical elements: 

  • Stage rigging options
  • Equipment requirements
  • Decompression techniques
  • Risk management
  • Decompression breathing gases 
  • Dive planning
  • Gas management
  • Contingency planning
  • Problem solving procedures 
  • Decompression and physiology theory

During the course you will plan simulated decompression dives and follow those plans on the dives, with a lot of emphasis team positioning, communiation, buoyancy, problem solving and self sufficiency. The course concludes with you going to decompression on the last 1 or 2 dives, to a maximum depth of 45m, and use hyperoxic nitrox mixtures to use as a decompression gas.

This course provides a solid foundation from which to continue your technical diving training, and opens up many more options with your diving.    

Course Details:

  • 3 days
  • 4 open water dives minimum
  • Max depth 45m/180ft

Decompression Procedures 20,000 baht

or, combine with Advanced Nitrox for only 30,000 Thai Baht


  • 18 years of age or older
  • Advanced Nitrox Diver
  • 25 Logged Dives

Extended Range

By the time you've done the decompression procedures course, you will be conversant with the methods and procedures associated with decompression diving using hyperoxic mixtures. Progressing beyond this means going deeper than 45m, staying at the bottom for longer, or both. Extended range takes you to the limit of using air as a bottom gas; 55m. Beyond this, gas narcosis becomes increasingly dangerous. At 6.5 atmospheres, increased gas consumption and inert gas tissue loading necessitates using additional decompression gases, and performing longer decompression stops than deco diving to 45m.

A big part of the extended range course is focussed on narcosis management. The difference between the effects of gas narcosis at 45m and 55m can be considerable, so exposure during the course is fundamental. Moreover, risk management is also discussed, and task loading increased during the training dives to ensure that, in the event of a problem at any point on an extended range dive, you are able to deal with any issue comfortably.

Although extended range is a good alternative for divers that are put off by the prohibitive cost of using helium on deeper dives, carrying, and using additional decompression cylinders also prepares you for the TDI trimix course. 

Items covered during the course include:

  • Equipment requirements and configuration
  • Decompression options
  • Emergency planning and procedures
  • Requirements for dive planning
  • Buddy rescue
  • Narcosis management

Course Details:

  • 3 days
  • 4 open water dives
  • Max depth to 55m

Course Fees:

  • Extended Range 25,000 Thai Baht
  • (All course fees and materials included with no hidden extras).


  • 18 years of age or older
  • Decompression Procedures diver
  • Proof of at least 100 logged dives, 25 of which must be deeper than 30m

Certification Options:

  • TDI


Diving deeper than 55m is considered too dangerous on air. Any dives beyond this point require using trimix as a breathing gas on the bottom portion of the dive. This involves adding helium to reduce the amount of nitrogen, and therefore reduce the effects of gas narcosis. 

The trimix course qualifies you to dive to a maximum depth of 60 m/200 feet with a blend of helium appropriate for the planned depth, and a minimum amount of oxygen of 18%. The course covers topics and skills such as:

  • Team roles and responsibilities
  • Gas matching
  • Cylinder labeling
  • Dive planning and gas management
  • Equipment configurations
  • Thermal protection options

The course is normally run over three consecutive days. Four 4 training dives minimum are required for successful completion. We may require candidates to undertake a assessment dive with the course instructor prior to taking any bookings. The course fee includes required course manual and TDI certification fees. Boat fees and gas fills are not included. As on all higher level technical courses, instructor boat fees and gas costs are shared between students.

Course requirements:

1. Minimum age 18.
2. Decompression procedures diver
3. Proof of 100 logged dives

Advanced Trimix

Advanced-trimixThe TDI Advanced Trimix Diver course is the top level of training for open circuit divers wishing to dive to depths as deep as 100 m/330 feet In order to be able to do this, hypoxic levels of oxygen (below 17%) are used.  This course is perhaps one of the most informative and challenging, and upon completion you will be amongst some of the most elite divers. Your TDI Instructor will teach you

  • Equipment management
  • Multiple stage cylinder labeling and placement
  • Complex decompression planning and contingency planning
  • Dive team awareness and communication
  • Gas monitoring and management
  • Use of travel gasses

The TDI Advanced Trimix manual is one of the most up to date manuals and includes all the latest of technology and practices being used.

Course requirements:

  • Minimum age 18 years old
  • Proof of 100 logged dives, 25 of which must be deeper than 30m
  • Extended range or trimix diver
  • Experience in diving in a multiple cylinder configuration


Tech Dive Master

The TDI Divemaster Course is the first level certification in the TDI Leadership levels. During this course you will be challenged and learn what it is like to work with divers as they begin their technical diving experiences. You will learn how to manage divers, work the dive deck of a boat, and conduct enjoyable dives. Dive physics, physiology, how to conduct pre-dive briefing, how to assist technical instructors as well as how to be a professional TDI Divemaster are all part of the course. Your skills will be finely to demonstration quality and your knowledge levels increased to that of a professional.

Should you decide you want to teach technical diver courses in the future you will need to complete a SDI Open Water Scuba Diving Instructor course; here you will learn more about teaching academic and in-water presentations, conducting courses and diver management. Once you become an open water instructor you can expand your résumé and add the technical areas that interest you to teach.

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