BSAC’s Sport Mixed Gas CCR Diver (50m) course is a great way to take your rebreather diving to the next stage.

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.

This was a great way to incorporate the safe use of mixed gas into my rebreather diving. The course is packed with technical information but is delivered in an accessible way that has positively impacted on my diving and enjoyment of deeper wreck sites.

- Fran Hockley, Cardigan SAC

The Sport Mixed Gas CCR Diver (50m) course is the first step in mixed-gas diving for competent air-diluent rebreather divers. It will introduce you to using a 20/30 trimix diluent.

To enrol on the Sport Mixed Gas CCR Diver (50m) course you must have already successfully completed a BSAC CCR Diver (40m) course (or have equivalent certification from another recognised training agency). You must be at least 18 years old and be able to demonstrate high proficiency diving a rebreather, with 60 logged dives.

You will learn to plan and conduct CCR dives using diluents with at least 20 per cent oxygen and a maximum of 30 per cent helium. This will minimise the narcosis you may have suffered diving with an air diluent and you will extend your maximum depth to 50 metres.

You will develop your knowledge of mixed-gas CCR diving, including:

  • Theory of mixed-gas diving
  • Equipment and decompression systems
  • Advanced diving physiology
  • Practical diving techniques, including diving with a stage cylinder
  • Dive planning including gas choices, gas-loss management and run-time schedules

The Sport Mixed Gas CCR Diver (50m) course includes five theory sessions, a theory assessment, and a dry practical session on kit preparation. There is a sheltered-water training dive, to refresh CCR safety drills. Then you will spend at least 120 minutes underwater on a minimum of two open-water training dives, with a maximum of 30 minutes ascent time, to ensure that you have plenty of in-water time to practise the skills and discipline needed to carry out mixed-gas CCR diving.

This is a continually assessed course during which students must reach the required performance standards.

A BSAC Sport Mixed Gas CCR Diver (50m) is competent to plan and conduct CCR dives, including those with mandatory decompression, using diluent gas mixes containing at least 20 per cent oxygen and a maximum of 30 per cent helium. This will extend your CCR diving to a maximum depth of 50m. You will also be able to rescue another mixed-gas CCR diver from depth.

You could do this course at a regional event, local club or a Technical centre. Not all clubs and technical centres run Sport Mixed Gas CCR Diver (50m) courses, so please check if you are interested.

Alternatively, Book your place on a Regional course online now

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, including two delayed surface marker buoys and other surface detection aids, and the relevant rebreather. You will also need a fully kitted stage cylinder with a minimum capacity of seven litres, fitted with a second stage hose of at least 1.5m, to use as an independent alternate source.

Your next steps – developing your skills 

After completing Sport Mixed Gas CCR Diver (50m) and consolidating your skills, your options for deeper CCR diving significantly expands.

Website by NetXtra