This manual fills a gap in freediving literature. This book is the result of several years of dedicated research, perseverance, exercises and lots of practice in the water. The pursuit of a full understanding of the mechanisms of that “damned” equalization, a wall that every freediver, regardless of their depth, has encountered at some point in their freediving:• Anatomy of equalization• Real and virtual limits of equalization• Lungs capacity and equalization abilities• Equalization techniques• Equalization awareness• Learning the Mouth Fill• Otolaryngeal conditions