This workbook captures the best current practices in overhead instruction into one convenient workbook that will last a student from initial cavern training up through the full cave certification and that provides a great resource for reviewing important material by the seasoned cave diver. The workbook has been specially crafted to match the current NACD Standards & Procedures. This will enhance the quality of the experience for the student and provide a common standard for training at all levels. The workbook is upwards of 150 pages and includes useful outlines, photos and illustrations, cave maps, discussions and extensive calculations for gas math.

Glass and Water is the first book on underwater photography for freedivers. With contributions from expert underwater photographers this book teaches the skills, knowledge and equipment necessary to successfully pursue underwater photography without scuba gear. Rather than seeking to replace books on underwater photography, Glass and Water focuses on freediving techniques, equipment and photo opportunities. By carefully choosing or adapting freediving and photographic equipment some early hurdles can be avoided. Using appropriate freediving techniques can increase the length of time available for taking photographs underwater. And by being aware of the possibilities, frustrations can be avoided and good subjects sought out.