This is the second level certification course for divers wishing to utilize a closed circuit rebreather (CCR) for air diving or an entry into Helium diving. The objective of the course is to train you in the benefits, hazards and proper procedures for diving a CCR and to develop basic CCR diving skills to independently plan and conduct limited decompression dives to a maximum depth of 40 meters / 130 feet using an air diluent or 145 feet using a Helitrox (minimum 20% Oxygen) Trimix diluent for a maximum accumulated decompression time of 25 minutes for formal decompression diving with an equally-or more-qualified dive team.
Why learn decompression?
learning to use proper planning and procedures for modern decompression diving can open a world of opportunities that no-stop divers or “Sport Divers” just don’t have access to. It will give you the ability to venture deeper with assorted mixed gasses but often it means being able to spend more time on the deeper dives you already do and love. The absolute most time an open circuit diver will get at 100 – 130 feet is in the 10 – 15-minute time range. Using a CCR will get you significantly more time but adding the possibility of deco can give you even more.
As an example… Using a VPM planner, we plan the first dive of the day to 100 feet using a setpoint of 1.3. On this dive, we can now do 25-minutes staying at 100 feet without deco. If we allow up to 25 minutes of deco on the same dive we can now do a 100-minute dive at 100 feet! And that’s if you want to spend ALL of your time at the deepest point. For most purposes, a rebreather with the ability to comfortably perform up to 25 minutes of deco will open up just about any dive you want to do up to depths of 100 feet and those advantages continue as you go deeper. Being able to spend 5 times the amount of time a sport diver can get out of a 2 tank charter and being able to do it in a single dive is quite a bit of fun. That’s why it’s so much of an advantage to learn to do decompression especially with a rebreather that has as much as 4 or more hours of run time regardless of depth.