The TDI KISS Closed Circuit Rebreather Manual is the text-book literary assistant to the TDI KISS CCR certification course. This manual is broken down into eight separate chapters, including; course content and prerequisites, KISS design, CCR diving physiology, student preparation and maintenance, CCR dive planning, CCR dive procedures, and finally some necessary skills to complete this course.It is essential that the CCR student have an excellent diving physiology knowledge base. This course begins where advanced nitrox stops. Using the KISS Closed Circuit Rebreather Manual as a reference, students may utilize the Knowledge Quest work booklet by answering the provided questions with the most appropriate and accurate answers. The Knowledge Quest is designed to be used as an assessment for enrolled students and their respective instructors.