This is the second level certification course for divers wishing to utilize a Closed Circuit Rebreather (CCR) for mixed gas diving using a Helitrox Diluent. The objective of the course is to train divers in the benefits, hazards and proper procedures for diving a CCR and to develop basic CCR diving skills, to a maximum of 45 metres, using an air/nitrox/helium diluent for formal decompression diving. Students are permitted to utilize a diluent and bailout mix with no greater than a 20% helium content and no less than a 21% oxygen content and are permitted to use up to 100% oxygen for decompression.

This course is aimed at:

• The certified TDI Air Diluent Diver (or equivalent) who is looking to extend their depth limitations, learn CCR decompression procedures, and reduce narcosis
• The open circuit TDI Advanced Nitrox and Decompression Procedures or Helitrox Diver looking to utilize CCR technology to extend their depth limits and bottom times

The Training

• Knowledge Development – Once you have signed up for the course, we will provide you with a digital CD manual to read and complete the relevant knowledge reviews before your practical training. You also need to have a copy of the manufacturer’s manual for the specific unit. Your instructor will then review this and go into further detail covering topics such as those listed below, plus many others:
  • History and evolution of rebreathers
  • Gas physiology
  • Emergency procedures
  • Helium considerations
• Classroom training – After you have reviewed the key knowledge areas and ready to go you will then join your instructor for the practical element of your training and cover the following areas:
  • Emergency procedures
  • Gas requirement planning
  • Constant partial pressure of oxygen theory
• Practical training – After you have reviewed the key knowledge areas and ready to go you will then join your instructor for the practical element of your training and cover the following areas:
  • Manual set point control 
  • Bailout drills
  • Effective management of loop breathing volume
  • Post dive care and unit cleaning

Pre-requisites

• The TDI Advanced Nitrox Diver, Deco Procedures Diver or Helitrox diver or equivalent from agencies recognized by TDI 
• You are also required to have 50 logged dives and if the rebreather is a TDI approved sidemount rebreather, you must hold the TDI Sidemount Diver Certification or equivalent and provide proof of 10 logged sidemount dives