Are you wondering what that person on that dive boat was doing without a tank on their back but two on their sides? Are you already a sidemount diver, but interested in learning more about sidemount diving in caves? Are you curious what this sump diving thing is all about? If you've answered yes to any of these questions, this is a great book for you. Full of good information, tips, and tricks based on Brian Kakuk and Jill Heinerth's wealth of experience sidemount diving at all levels, this book is a must-read for any sidemount diver or anyone considering sidemount.