BSAC’s MOD 1 AP Mixed Gas Top-up course is a great way to take your rebreather diving to the next stage by introducing trimix and increasing your depth to 45m.

You will increase your awareness and safety, using a trimix diluent to minimise the undesirable effects of narcosis and increased gas density seen in deeper nitrox diving.

Whether you have come from another agency or completed BSAC's previous entry-level CCR course, this top-up will provide you with the necessary training to come into line with BSAC's new MOD 1 AP Vision CCR Diver (45m) qualification.

The MOD 1 AP Mixed Gas Top-up course qualifies a diver with an existing AP Vision air diluent qualification to use trimix. As well as extending the maximum depth of the qualification from 40 to 45 metres, use of trimix will also reduce gas density and narcosis giving a significantly enhanced experience.    

You will get additional training on the benefits of trimix, how to plan trimix CCR dives and complete two open water dives with mandatory decompression.

To enrol on the MOD 1 AP Mixed Gas Top-up Course you must have successfully completed a BSAC AP Vision CCR course, or equivalent, using air as the diluent. 

On successful completion of the course, you will be awarded the MOD 1 AP Vision CCR Diver (45m) qualification allowing you to dive with 20/35 trimix as the diluent.

The MOD 1 AP Mixed Gas Top-up course will extend your knowledge to include the physics and physiology associated with using trimix. The planning session will include lots of emphasis on selecting breathing gases with the optimum gas density ensuring you are prepared for the two open water dives.

Throughout the course, you will work closely with your instructor to achieve the skills and knowledge necessary to safely dive as a BSAC MOD 1 CCR Diver to a maximum depth of 45m.

A MOD 1 AP Vision CCR Diver (45m) is competent to plan and conduct CCR dives, including those with mandatory decompression, using an AP Vision rebreather. You will also be able to rescue another CCR diver from depth.

On successful completion of the course, you will be awarded the MOD 1 AP Vision CCR Diver (45m) qualification allowing you to dive with 20/35 trimix as the diluent.

You could do this course at a regional event, local club or a Technical centre. Not all clubs and technical centres run MOD 1 AP Mixed Gas Top-up courses, so please check if you are interested.

Alternatively, find a tech instructor near you to arrange your training.

Not a BSAC member? You can do this course by joining BSAC directly or joining via a local club. Find a club.

Students will be given a pack of supporting learning materials. You will need full open-water dive kit suitable for local conditions, an AP Vision rebreather and an appropriate bailout cylinder.

Your next steps – developing your skills 

After completing a MOD 1 AP Mixed Gas Top-up course and consolidating your skills, your options for club diving significantly expands.

  • You could progress to the soon-to-be-released MOD 2 CCR Diver (60m) and enjoy the benefits of reduced gas density and narcosis that using trimix as a diluent brings, bringing greater comfort and enjoyment at extended depths of up to 60m.
  • You could develop specific skills to expand your diving interests further, including technical and logistical courses such as Compressor Operation and Mixed Gas Blender. Check out the Skill Development Courses (SDCs) you can get involved in.
  • You could sign up for BSAC’s Instructor Foundation Course (IFC) to start your instructing journey with BSAC.
  • Already an Open Water Instructor? You could develop your existing skills to become a Technical Instructor.

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