TDI JJ-CCR Air Diluent Decompression Procedures Unit Specific for JJ Rebreathers, the TDI Air Diluent Closed Circuit Decompression Procedures Diver Course (certification depends on unit used during training) is the second level certification course for divers wishing to utilize a closed circuit rebreather (CCR) for air diving. The objective of the course is to train divers in […]