| There are two onboard cylinders (3 litres on the Inspiration, 2 litres on the Evolution). One contains pure Oxygen, the other a diluent Gas - usually Air.
NOTE: If Trimix / Heliox is used instead of air as the diluent supply and modification is made to the bailout contingency, both APD CCRs can be dived to depths of 100m. However, it must be stressed, such advanced closed circuit diving should only be carried out by suitably experienced divers who have achieved the appropriate advanced unit-specific CCR qualification with one of the recognised training agencies. |
What is CCR? 
