During Level 2 training the participant develops the necessary diving skills, techniques and knowledge required to responsibly perform decompression dives with a closed circuit rebreather. There are two options for this course: Option: CCR II Extended Range (Air) Diver - Decompression diving with air as diluent gas to a maximum depth of 50m. Option: CCR II Extended Range (Normoxic Trimix) Diver - Decompression diving with air and normoxic Trimix as diluent gas to maximum depths of 50m and 60m respectively