Course 27 (AS 2815.4) Part 4

Mixed Gas (Saturation) Diving Offshore To 300 Metres

The ADAS Mixed Gas bell diving course in Tasmania is the highest diving level available to any diver. It also has the greatest potential remuneration for diving work. For any diver who wishes to have the greatest spectrum of diving available to them, then this qualification should definitely be included in their portfolio. When successfully completed will lead to the issuing of an ADAS Part 4 certificate. We are the only training facility in the Southern Hemisphere to offer this level of training.

Both ADAS and HSE enjoy cross recognition, which you can confirm by visiting the HSE or ADAS websites if you so wish.

The ADAS qualifications are also recognised by IMCA (International Marine Contractors Association).

Course Details

  • Duration: 3 weeks
  • Location: Lake Cethana

Course Minimum Qualification Requirements:

To qualify to attend the Mixed Gas Diver training all students must meet the following ADAS course prequalification’s.

  • A current ADAS Part 3, or HSE, or other internationally recognised equivalent certificate - Must be held for at least 12 months. (Currency is generally accepted as having completed 10 hours diving in the past 6 months.) - (HSE qualifications must include the following modules to be considered – HSE SCUBA, HSE Surface Supplied to 50 metres, HSE Wet Bell Top Up and Underwater Tools module.)
  • Total 50 hours logged bottom time as either a Part 2 or Part 3 diver.  Included in the 50 hours bottom time should be at least 6 hours bottom time deeper than 30 metres.  No dives shorter than 15 minutes bottom time is to be counted and for a dive and where the bottom time is longer than 2 hours then only 2 hours is to be counted. (Training and Navy dives will NOT be accepted – All logged dives must be Surface Supplied and must be working dives performed in open water ie not in compression chambers, pools or tanks.   Additional evidence may be requested i.e. letter from previous company employer.  There is an expectation that the diver should have experience as an offshore diver. )
  • **Current recognised Senior or Apply First Aid certificate (First Aid qualifications must meet the competency requirements of HLTFA301B Apply first aid or current DMT Certification).
  • **Current recognised Oxygen Provision certificate (must meet the competency requirements of national code PUAEME003C Administer Oxygen in Emergency situations).
  • Current commercial diving medical - AS2299. HSE or IMCA – Must be by a approved and recognised commercial diving doctor.  Medical must state you are fit to dive for Mixed Gas Diving (Saturation).  Medicals that cover you for a duration of over 12 months will not be recognised by ADAS.  ADAS require candidates must undergo a commercial diving medical every 12 months to the AS2299 standard.
  • Be a minimum age of 19 years old
  • Photo ID - (E.g., Driver Licence, Passport or National ID Card)

**Note:  Although you do not have to have the more advanced certification, Apply Advanced First Aid – HLTFA402B, but if you do, it will cover all of the ADAS requirements for First aid and Oxygen provision.

Subjects Covered

The theory consists of the following:

  1. Introduction to the course
  2. Introduction to bell diving
  3. Physics of mixed gas
  4. Physiology of deep diving and mixed gas
  5. Bounce and Saturation Decompression tables
  6. Saturation and bell systems
  7. Gas Handling 
  8. Gas Analysis
  9. Gas Reclaim
  10. DP Vessels

The practical will consist of:

12 shallow bell runs using the system on the barge. This will be followed by a deep dive encompassing 3 bounce dives and 2 saturation excursions. The maximum depth attained during these dives is 100 metres.

During the course you will be assessed at stages to ensure that you are keeping up with the course work. There will be a final exam to test the student's retention of theoretical knowledge and competence assessments to test practical ability.

Included in this training course we also include the IMCA ALST training and qualification.

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