The TDI Diving Rebreathers Manual is the text-book literary assistant to the TDI CCR certification course. A perspective student will find this course to give descriptive, educational, and in-depth knowledge for a variety of topics regarding the history of rebreathers, an introduction to rebreathers, the mechanics behind CCR's, dive planning, diving with a rebreather, emergency procedure drills, as well as avoiding rebreather incidents and accidents.